Author Topic: Stock fuel tank mods for efi conversion?  (Read 1804 times)

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Offline Mad_goat_67

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Stock fuel tank mods for efi conversion?
« on: April 8, 2020, 01:31:33 pm »
Hey my name is Kevin and I have a 75 Ramcharger. Itís got a built 440 that currently has a Holley 750 double pumper sitting on an edelbrock RPM intake. Sheís on 38ís with 1 ton running gear. Been having issues when wheeling at extreme angles with sputtering, throttle hesitation and the truck flat out dies sometimes. Finally pulling the trigger on doing the EFI conversion. Taking a hard look at the Holley Sniper self tuner. My question is as follows: if I stick with the original gas tank (fuel system is completely stock), would I need to run a hydra mat or bladder system to avoid getting air in the fuel pick up when the tank is sloshing or otherwise at a radical angle? Called Holley and they said just tap the pick up line into the bottom of the tank, but that seems like I may still have an issue down around 1/4 of a tank. I am also undecided on running an external fuel pump or internal. If I post this in the wrong area please let me know. Thank you in advance
If it jams, force it. If it breaks, it needed replacing anyways...

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    Offline jungle

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #1 on: April 8, 2020, 03:08:52 pm »
    1988 RC.the gold one   pics
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    Offline Mad Max

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #2 on: April 8, 2020, 04:58:20 pm »
    First off - welcome!

    ...while I haven't got it all plumbed in yet I am also preparing a big block Mopar truck for a Holley Sniper EFI system - in my case all getting crammed into a 2002 Dakota quadcab.  I am taking a different approach to my fuel system tho - I will be using a 'surge tank' - essentially a miniature gas tank under the hood, complete with its own internal high pressure pump.  The main reason I'm going this route is simply to keep the OE tank as OE as possible, including the fact that once it's all built the OE tank will be very difficult to get to in the event I need to fix something.

    My OE gas tank will have a basic 12v low pressure pump which will supply fuel to the surge tank (and a return line back to the OE tank), and the EFI will get it's high-pressure fuel from the surge tank (with it's own return line back to the surge tank). 

    I am using a RobbMc surge tank - http://robbmcperformance.com/products/powersurge.html

    I'm a couple months away from plumbing it all up but that is my plan.

    - Sam
    « Last Edit: April 10, 2020, 09:44:15 am by Mad Max »
    2002 Dakota Quad Cab 4x4 - 440/46rh/Atlas4/D60/14b/40s
    2007 Cummins Ram 3500 Megadually 4x4 "Big Mack" - 5.9/G56
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    Offline crazzywolfie

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #3 on: April 8, 2020, 05:33:42 pm »
    a hydra mat might be a good idea for the extreme angles to keep the fuel in the system at all angles even if you are low on fuel. the way Sam mentioned would work also but just a bit more complicated.
    93 RamCharger 2wd 318
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    Offline DODGEBOYS

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #4 on: April 8, 2020, 06:44:22 pm »
    l,ve had my RC at every extreme angle there is including upside down and have never had a fuel problem , l also made sure my tank baffle is not broken loose and the pickup bent up [ common problem on plastic tank RC's without a skid plate] the baffle in a RC tank holds close to a Gal of gas , which should be good enuf too climb up or drive down any Mtn
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    Offline Mad Max

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #5 on: April 8, 2020, 06:48:28 pm »
    yah I wanted to use an RC tank but with my other plans there was just no way to make it fit.  PLan B was to use hydramats in side the very long Dakota tank...and I had already ordered them but there would have been a lot of custom fabrication to get the hydramats 1) in/at the ends of the tank and 2) modifying the sending unit, so I returned them when I came up with the surge tank plan (actually I think it was my friend Ben who gave me the idea - credit where deserved ;) ).
    « Last Edit: April 10, 2020, 09:46:27 am by Mad Max »
    2002 Dakota Quad Cab 4x4 - 440/46rh/Atlas4/D60/14b/40s
    2007 Cummins Ram 3500 Megadually 4x4 "Big Mack" - 5.9/G56
    1952 Willys M-38 "Poncho"

    Wanted:  '71 Dodge Dart Custom (4-door) - "running", all-stock restorable car in decent condition
     

                    Ö.there's always a way...

    Offline Mad_goat_67

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #6 on: April 9, 2020, 11:09:29 am »
    Thanks for the feedback! Jim that looks awesome. And Iím going to look into the surge tank now as well.
    If it jams, force it. If it breaks, it needed replacing anyways...

    Offline ram-it

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #7 on: April 10, 2020, 12:38:34 am »
    would I need to run a hydra mat or bladder system to avoid getting air in the fuel pick up when the tank is sloshing or otherwise at a radical angle?


    Yes, i would recommend a hydramat, it works as advertised. Prior to the hydramat not only could i hear pump starvation on corners but i could tell how much fuel was in my tank from the sound of the pump just from the head pressure on the pickup changing the pump frequency when it was working harder. Once installed my pump has a more flatline noise.

    Offline crazzywolfie

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #8 on: April 10, 2020, 09:14:58 am »
    but a surge tank looks like it would be cheaper and you wouldn't have to modify any of the stock components to make it work. i know i am considering getting one for my elcamino if i can find a decent spot to mount one. i have considered in tank pump but no cheap or easy way to do it.
    93 RamCharger 2wd 318
    89 RamCharger 4x4 318/727/3.21 on 33's
    81 d150 long box 318 670CFM Holley Carb
    If you can't fix it with a hammer, you've got an electrical problem

    Offline Mad Max

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #9 on: April 10, 2020, 09:48:44 am »
    yah that was the issue I ran into.  Modifying the original sending unit and getting the hydramats extended to the ends of the long Dakota gas tank while also remaining on the bottom was a real brain twister - the surge tank resolved all of the issues in one nice new well made package...at least that's how it should all work on paper - hopefully I'll know for sure in about 6 months...
    2002 Dakota Quad Cab 4x4 - 440/46rh/Atlas4/D60/14b/40s
    2007 Cummins Ram 3500 Megadually 4x4 "Big Mack" - 5.9/G56
    1952 Willys M-38 "Poncho"

    Wanted:  '71 Dodge Dart Custom (4-door) - "running", all-stock restorable car in decent condition
     

                    Ö.there's always a way...

    Offline crazzywolfie

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #10 on: April 10, 2020, 11:19:42 am »
    at least on something like your Dakota modifying the sending unit is not so tricky since the fuel lines and connectors are already there. most old sending units are so small it is hard to ad 2 wires to power the fuel pump and possibly 1 more fuel line if you you don't have a return line yet.
    93 RamCharger 2wd 318
    89 RamCharger 4x4 318/727/3.21 on 33's
    81 d150 long box 318 670CFM Holley Carb
    If you can't fix it with a hammer, you've got an electrical problem

    Offline Killerbee

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #11 on: April 10, 2020, 11:23:37 pm »
    On your '75 do you still have the mechanical fuel pump?  If so use that to move fuel from the truck's tank to the surge tank.  That'll keep the surge tank full.  It'll be pretty simple to setup using the RobMC surge tank. 

    -Ben

    Offline KurtfromLaQuinta

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #12 on: April 10, 2020, 11:28:47 pm »
    I wanna say something here, but it's bedtime. So I'll come back tomorrow.  ;D
    500 c.i.- Scat Crank, Scat Rods, Indy Aluminum heads, Comp XR280HR Cam, Six-Pack, Milodon 8 qt. Pan, 727  (reverse-manual, low band apply, 5 clutch disc, 3 qt. xtra. pan), N.P. 205, Ford 9" rear axle (4:11, 31 spline axles, Detroit Locker, converted/ disc brakes). Dana 44 front (converted/ disc, 4:10, Tru-Trac limited slip). Hydra Boost Brake Booster, Gear Vendors OD. 600+ ft. lbs. of torque

    Offline ram-it

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #13 on: April 11, 2020, 06:24:33 pm »
    but a surge tank looks like it would be cheaper

    Did some research on surge tanks and decided they weren't for me. Costs are higher for an all in one. About the same for a DIY. I was going to go this route if I did DIY
    https://bcbroncos.com/shop/fuel/fuel-pumps-and-filters/11-50111-accumulator-filter-1-qt-long-version-for-early-bronco/

    Modifying the original sending unit and getting the hydramats extended to the ends of the long Dakota gas tank while also remaining on the bottom was a real brain twister

    I regret not taking pictures. It's not too complicated. Not sure what a Dakota tank looks like but these are the steps for an in-cab 75 w150:

    There is fuel line (which is quite stiff) that is rated to be submerged. Don't use regular fuel line. Cut the end of the sending unit off at the bend, attach hose with hose clamp, cut to length, attach to in tank pump, hydra attaches directly to underside of pump (PART# 16-111). For a pump I used a Deatschwerks DW200 because reviews stated it was quieter than most pumps which was a priority for an in-cab tank. It emits a high pitched frequency that is easy to ignore like an old CRT television if anyone is curious.

    Depending on vintage of tank you will then also need to install a return if not already there. Buy a bulkhead fitting or braze another spigot on - I used a bulkhead fitting - if I had the tooling I definitly would have brazed. Attach a hose to the bulkhead fitting and just tie wrap it to the new pump assembly so the return outlets onto the hydramat. Was a real tight fit. For the wires I drilled a hole, used a grommet and then slathered the whole works with fuel tank sealer I bought from an aircraft supply store to properly seal it all up. You can get wire bulkhead fittings as well but all the ones I found were a fortune and probably wouldn't fit because of the return taking up space on the sending unit. Once again the sending unit you have might have more space.

    And to top it off I used a filter/regulator assembly (PART# 12-888) so that I didn't have to run a return into the engine compartment. The total length of my return line is probably 12". This is optional obviously because the sniper has a built in regulator already. For me it just made the install cleaner keeping it in-cab.

    And because I never mentioned it I'm using a Sniper. Had a Fitech with a frame rail mounted pump previously and as a system it was a piece of shit. The Sniper is not perfect but its better. Neither system seems to like a granny shift manual trans or as the girlfriend likes to call it after having driven it once - grampies old Massey Fergeson. This summer it's getting a NV4500 to speed up the shifts if plans work out.
    « Last Edit: April 11, 2020, 06:43:24 pm by ram-it »

    Offline crazzywolfie

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #14 on: April 11, 2020, 07:28:10 pm »
    Did some research on surge tanks and decided they weren't for me. Costs are higher for an all in one. About the same for a DIY. I was going to go this route if I did DIY
    https://bcbroncos.com/shop/fuel/fuel-pumps-and-filters/11-50111-accumulator-filter-1-qt-long-version-for-early-bronco/
    if you buy a all in 1 surge tank yes they can get expensive. you can buy all the parts to build a surge tank setup for under $100. if your good with a welder you could likely build one and only have to buy a fuel pump for $20-30.
    93 RamCharger 2wd 318
    89 RamCharger 4x4 318/727/3.21 on 33's
    81 d150 long box 318 670CFM Holley Carb
    If you can't fix it with a hammer, you've got an electrical problem

    Offline ram-it

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #15 on: April 11, 2020, 08:11:07 pm »
    At what point do you defeat the purpose though?

    Offline crazzywolfie

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #16 on: April 11, 2020, 08:37:19 pm »
    he is wanting to install fuel injection. i don't know if there is on a budget. ideally the surge tank suits things mainly for the fact it can take the low pressure and convert it to the high pressure needed to run the engine without butchering up the stock fuel tank. even running a inline high pressure pump usually requires you modifying the stock sending unit so it has 3/8" or an6 line from the pickup to the pump. a surge tank just gets rid of the headache. i have been considering doing it on my elcamino but i need to slide underneath it to see if there is anywhere to mount one safely and out of the way. i will also have to drop the tank to install a return line in my case since there isn't any there that i could find. 
    93 RamCharger 2wd 318
    89 RamCharger 4x4 318/727/3.21 on 33's
    81 d150 long box 318 670CFM Holley Carb
    If you can't fix it with a hammer, you've got an electrical problem

    Offline ram-it

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #17 on: April 11, 2020, 08:48:09 pm »
    No matter which way you go you need to put a return in the tank - the tank 'butchery' is the same for both methods.

    The purpose of a surge tank is to solve fuel starvation due to a non efi baffled tank and fuel pickup which is completely solved neatly and cleanly with a hydramat - the hydramat being considerably cheaper than most all in one surge tanks and not far off par from most hokey DIYs which all leave you with 2 fuel pumps and 2 sources of failure and usually headaches with possibly fuel boiling and vapour lock.

    The real question for me is not whether or not to run a hydramat but with you go internal or external fuel pump. My vote is internal. Runs cooler and quieter and is arguably the same amount of work to install.

    Offline KurtfromLaQuinta

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #18 on: April 11, 2020, 08:58:47 pm »
    You say you have a built 440. Just how built is it?
    I ran an Accel EFI unit on my first stroker 440 back when those throttle body units were just coming out. I was never happy with it. I know there's lots of options for the Holley Sniper units. And things have advanced quite a bit since I had my unit.
    To me, throttle bodies are just glorified carburetors. I'm pretty sure, with a correct tune on a carb, you can get the same performance as a Sniper F.E.  Of course, your looking for the off road side of things here. Where you want the ability to do severe angle without the normal carb issues.
    My next adventure into fuel injection... I would go the SMPI route. It's the way of the future... well they are in use on every single car and truck on the road today. It's the way fuel injection is supposed to work.
    A little more pricey than a throttle body setup, but it's the top of the line way to do it. And it's a very quiet system. The throttle body ones out there today are very noisy.
    500 c.i.- Scat Crank, Scat Rods, Indy Aluminum heads, Comp XR280HR Cam, Six-Pack, Milodon 8 qt. Pan, 727  (reverse-manual, low band apply, 5 clutch disc, 3 qt. xtra. pan), N.P. 205, Ford 9" rear axle (4:11, 31 spline axles, Detroit Locker, converted/ disc brakes). Dana 44 front (converted/ disc, 4:10, Tru-Trac limited slip). Hydra Boost Brake Booster, Gear Vendors OD. 600+ ft. lbs. of torque

    Offline crazzywolfie

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #19 on: April 11, 2020, 09:01:27 pm »
    there is not enough room in a dodge sending unit to run an extra 2 wires. they are pretty tiny sending units. also it would be a tight fit to get a fuel pump in the tank along with the sending unit. the easiest way would be one of them kits with a fuel pump assembly that you cut another hole in the tank to mount or custom tank.

    the cheapest hydramat starts at $150. between that and the other parts the numbers add up pretty quick.
    93 RamCharger 2wd 318
    89 RamCharger 4x4 318/727/3.21 on 33's
    81 d150 long box 318 670CFM Holley Carb
    If you can't fix it with a hammer, you've got an electrical problem

    Offline Mad_goat_67

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #20 on: April 13, 2020, 04:56:32 pm »
    Kurt- itís a late Ď69 block 440 bored .030 over. Align honed, magnafluxed, decked .040, deburred. Forged pistons, rods, and crankshaft. Hughes performance cam, Hughes lifters, and Hughes valve springs. 906 heads rebuilt. 9.06-1 compression. Hooker competition headers. And sheís a 4-speed 💪🏻

    I elected to go with the Holley sniper self tune kit. I bought the kit that comes with the external fuel pump set up, however I have an internal one that I can make work if Iím not happy with the external. ďRam-itĒ- I would in an ideal world run a baffled tank with an internal pump. But Iím gonna give this a go with the hydra mat And see if holleyís claim is legit. Also, I havenít bought the hydra mat yet. Gonna drop the tank this week and figure out the dimensions I need.

    I looked into surge set up and the price was not very much more expensive than the route Iím on now after adding it all up. And yes, a return line fo sho. Thanks for all the feedback!
    If it jams, force it. If it breaks, it needed replacing anyways...

    Offline KurtfromLaQuinta

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #21 on: April 13, 2020, 06:11:29 pm »
    Kurt- itís a late Ď69 block 440 bored .030 over. Align honed, magnafluxed, decked .040, deburred. Forged pistons, rods, and crankshaft. Hughes performance cam, Hughes lifters, and Hughes valve springs. 906 heads rebuilt. 9.06-1 compression. Hooker competition headers. And sheís a 4-speed 💪🏻

    I elected to go with the Holley sniper self tune kit. I bought the kit that comes with the external fuel pump set up, however I have an internal one that I can make work if Iím not happy with the external. ďRam-itĒ- I would in an ideal world run a baffled tank with an internal pump. But Iím gonna give this a go with the hydra mat And see if holleyís claim is legit. Also, I havenít bought the hydra mat yet. Gonna drop the tank this week and figure out the dimensions I need.

    I looked into surge set up and the price was not very much more expensive than the route Iím on now after adding it all up. And yes, a return line fo sho. Thanks for all the feedback!
    Cool! Keep us all informed on the progress.
    Back when I ran the throttle body fuel injection on my first stroker in '91. I got into my tank (74's have a behind the seat 26 gallon steel tank). I cut a rectangular hole in the top of it and made a baffle stystem that worked quite well. I brass brazed a cover over my new opening. Since I put a Six Pack on my engine after the DFI issue, I just left the baffle setup in the tank. 
    500 c.i.- Scat Crank, Scat Rods, Indy Aluminum heads, Comp XR280HR Cam, Six-Pack, Milodon 8 qt. Pan, 727  (reverse-manual, low band apply, 5 clutch disc, 3 qt. xtra. pan), N.P. 205, Ford 9" rear axle (4:11, 31 spline axles, Detroit Locker, converted/ disc brakes). Dana 44 front (converted/ disc, 4:10, Tru-Trac limited slip). Hydra Boost Brake Booster, Gear Vendors OD. 600+ ft. lbs. of torque

    Offline crazzywolfie

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #22 on: April 13, 2020, 10:25:18 pm »
    hopefully you have better luck with a inline pump than i did. i had mine fail less than 3 days after install. ended up just mounting a fuel injected fuel tank in the bed and ran it like that till the cam failed. that is pretty much the reason i am thinking about swinging the fuel injection to the elcamino now.
    93 RamCharger 2wd 318
    89 RamCharger 4x4 318/727/3.21 on 33's
    81 d150 long box 318 670CFM Holley Carb
    If you can't fix it with a hammer, you've got an electrical problem

    Offline KurtfromLaQuinta

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #23 on: April 13, 2020, 10:29:57 pm »
    till the cam failed
    Flat tappet hydraulic?
    500 c.i.- Scat Crank, Scat Rods, Indy Aluminum heads, Comp XR280HR Cam, Six-Pack, Milodon 8 qt. Pan, 727  (reverse-manual, low band apply, 5 clutch disc, 3 qt. xtra. pan), N.P. 205, Ford 9" rear axle (4:11, 31 spline axles, Detroit Locker, converted/ disc brakes). Dana 44 front (converted/ disc, 4:10, Tru-Trac limited slip). Hydra Boost Brake Booster, Gear Vendors OD. 600+ ft. lbs. of torque

    Offline Mad_goat_67

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #24 on: April 16, 2020, 11:34:45 am »
    Update... the tank is in great shape. The sending unit looks fine, but Iím going to have to modify it to run a larger line. I was surprised that the opening was only 2Ē. Pretty much every other vehicle Iíve worked on and restored has at least 3Ē-3 1/2Ē opening. This has created an interesting issue for me. Since the tank is plastic, the hydra mat has to be installed through the opening. Obviously cant cut the tank and weld it back together. Once I had the tank out, based on its dimensions, I wasnít sure I would be able to fit ďthe largest hydra mat possibleĒ as Holley recommends. So I ordered two, the 8x8 cross and the 8x15 cross. Ideally the 8x15 fits in the 2Ē hole hahaha another note, Holley provided me with a bunch of rubber hose for fuel line. 👎🏻. Not running that... so hereís my thought process: with the return dumping right on the hydra sock, and the tank being 20+ gallons, even if I end up running the smaller hydramat, I think the only way I would have a fuel delivery issue regarding air in the pick up, is if Iím wheeling aggressively with like, less than 2 gallons of gas in there at an extreme angle. I always make sure Iíve got a lot of fuel in there. Canít remember ever wheeling hard with 1 gallon left. Anyways... just waiting on the hydra mats to arrive today.
    If it jams, force it. If it breaks, it needed replacing anyways...

    Offline Mad_goat_67

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #25 on: April 23, 2020, 04:51:56 pm »
    Ok. Everything installed three days ago. I believe I have a throttle cable or otherwise throttle linkage issue. Have a new throttle cable enroute due to arrive Saturday. She runs beautifully so far except for the cable/linkage issue. She idles fine, but she wonít let me go from idle to taking off normal. Itís catching and when it finally goes Iím at like 3,200 rpm. I ran through all the trouble shooting and Iím 100% sure itís not the efi unit or the linkage bracket attached direct to the fi unit. Somewhere between the linkage connection there and the top of the rod above the gas pedal. Anywho... once I solve that, Iíll give the full report.
    If it jams, force it. If it breaks, it needed replacing anyways...

    Offline crazzywolfie

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #26 on: April 23, 2020, 05:14:14 pm »
    could try posting some pics of the cable/linkage and see if we can spot any issues. does it work smoothly with the cable off under the hood?
    93 RamCharger 2wd 318
    89 RamCharger 4x4 318/727/3.21 on 33's
    81 d150 long box 318 670CFM Holley Carb
    If you can't fix it with a hammer, you've got an electrical problem

    Offline ram-it

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #27 on: April 28, 2020, 12:31:20 am »
    Keep in mind it takes a month or two for the unit to fully learn depending on how much you drive it and for how far.

    Offline volaredon

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #28 on: May 1, 2020, 05:11:57 pm »
    we went the other way on my son's 89 RC.... the OEM Holley TBI was awful.... his truck now has Mopar ECU and a Carter-brock carb.  went with an 87 tank and harness...Ö along with a mechanical pump ---yes, we changed the cam to compensate for the mechanical fuel pump drive. along with dropping the rest of the 76 360 in, along the way.

    Offline crazzywolfie

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #29 on: May 1, 2020, 05:45:01 pm »
    the OEM Holley TBI was awful....
    you must not live where it gets cold in the winter. when the TBI system is working good it is fine. it is when you start having issue that it can bee tricky to diagnose. personally i am not a fan of waiting 5-10 minutes in the cold weather for the carb to warm up enough to drive without having it stall out. in the summer it is not an issue but winters suck when you got to when you got to wait especially when you only need to make a 2-5 minute trip.
    93 RamCharger 2wd 318
    89 RamCharger 4x4 318/727/3.21 on 33's
    81 d150 long box 318 670CFM Holley Carb
    If you can't fix it with a hammer, you've got an electrical problem

    Offline Mad_goat_67

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #30 on: May 4, 2020, 09:00:27 pm »
    ok. Throttle cable/linkage fixed. She runs like a champion so far. Got all my timing data and such input into the computer. I personally donít find the computer ďso easy a caveman can do itĒ, but at the same time,  Iím not having any issues at all. The instruction manual is more than Iíve read in like 2 years probably lol j/k, but itís a god read. Feels just as powerful as before. This weekend I will take her to a spot that I can safely have her at aggressive angles to test the hydra mat. Iíll prob try to make sure sheís around a quarter tank just to be sure it functions.
    If it jams, force it. If it breaks, it needed replacing anyways...

    Offline Mad_goat_67

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #31 on: May 12, 2020, 09:50:34 am »
     I took the truck down to ďEĒ on the gas gauge (took a while since she was optioned with the larger tank) and had her pointed up and down and I had no issues with fuel delivery, hesitation, and she never died on me. So far Iím very happy with the conversion and the hydra mat. I can barely hear the external Pump since the truck is aggressively loud. All in all, everything is working as advertised and I am satisfied so far. Whenever Hollister Hills opens back up, Iíll head that way and put her through her paces. Thanks for all the advice and opinions during this. I feel like I was able to have a more well rounded approach to the project.
    If it jams, force it. If it breaks, it needed replacing anyways...

    Offline KurtfromLaQuinta

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #32 on: May 12, 2020, 10:25:50 pm »
    I took the truck down to ďEĒ on the gas gauge (took a while since she was optioned with the larger tank) and had her pointed up and down and I had no issues with fuel delivery, hesitation, and she never died on me. So far Iím very happy with the conversion and the hydra mat. I can barely hear the external Pump since the truck is aggressively loud. All in all, everything is working as advertised and I am satisfied so far. Whenever Hollister Hills opens back up, Iíll head that way and put her through her paces. Thanks for all the advice and opinions during this. I feel like I was able to have a more well rounded approach to the project.
    It's good when the gas tank and the lines line up.  ;D
    500 c.i.- Scat Crank, Scat Rods, Indy Aluminum heads, Comp XR280HR Cam, Six-Pack, Milodon 8 qt. Pan, 727  (reverse-manual, low band apply, 5 clutch disc, 3 qt. xtra. pan), N.P. 205, Ford 9" rear axle (4:11, 31 spline axles, Detroit Locker, converted/ disc brakes). Dana 44 front (converted/ disc, 4:10, Tru-Trac limited slip). Hydra Boost Brake Booster, Gear Vendors OD. 600+ ft. lbs. of torque

    Offline Mad Max

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #33 on: May 13, 2020, 07:40:12 am »
    those hydramats looked cool - glad to hear they work 'as advertised' {cool}
    2002 Dakota Quad Cab 4x4 - 440/46rh/Atlas4/D60/14b/40s
    2007 Cummins Ram 3500 Megadually 4x4 "Big Mack" - 5.9/G56
    1952 Willys M-38 "Poncho"

    Wanted:  '71 Dodge Dart Custom (4-door) - "running", all-stock restorable car in decent condition
     

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    Offline GusChiggins86

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #34 on: June 1, 2020, 12:15:15 pm »
    So I am converting my 89 TBI to a Sniper EFI. Here's are the options I'm considering:

    1. Keep the stock 90* plastic fittings on top of the tank module (green top)

    2. Remove the 90* plastic fittings and hose clamp directly over the green barbed ends.

    3. New bulkhead fitting if needed.

    Some of the IDs in the stock module are smaller than the 3/8" lines I will be upgrading to, but hopefully not a deal breaker for the EFI system.
    '89 Ramcharger 318/4x4/727/ 3.23 GR
    '09 Ram 1500 5.7 Hemi 4X4

    Offline Mad Max

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #35 on: June 1, 2020, 12:34:47 pm »
    ...so I'm feeding a 440 on my Sniper system, and I'm running 5/16 lines (and standard low pressure electric pump) from the tanks to the surge tank, and 3/8 from the surge tank (and high pressure pump) to the Sniper throttle body.  I'm sure 5/16 lines would be plenty to feed my 440, but the Sniper is set up for 3/8 so I'm not changing it.  I'm sure your stock fittings and sizes will be plenty for your system.
    2002 Dakota Quad Cab 4x4 - 440/46rh/Atlas4/D60/14b/40s
    2007 Cummins Ram 3500 Megadually 4x4 "Big Mack" - 5.9/G56
    1952 Willys M-38 "Poncho"

    Wanted:  '71 Dodge Dart Custom (4-door) - "running", all-stock restorable car in decent condition
     

                    Ö.there's always a way...

    Offline GusChiggins86

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #36 on: June 1, 2020, 12:50:23 pm »
    Thanks for the feedback,

    The folks at Holley were super helpful when I called them up to order my Sniper package. They took a look at all the parts I picked out and set me straight on a couple fittings, and when I asked about a discount, they worked up a pretty good deal for me too.
    '89 Ramcharger 318/4x4/727/ 3.23 GR
    '09 Ram 1500 5.7 Hemi 4X4

    Offline crazzywolfie

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #37 on: June 1, 2020, 04:23:40 pm »
    Some of the IDs in the stock module are smaller than the 3/8" lines I will be upgrading to, but hopefully not a deal breaker for the EFI system.
    i don't think that should be an issue. the stock lines are like 5/16 but should be fine. if that size line worked to pump 40-60psi to 8 injectors it should have no problem keeping 4 fed.
    93 RamCharger 2wd 318
    89 RamCharger 4x4 318/727/3.21 on 33's
    81 d150 long box 318 670CFM Holley Carb
    If you can't fix it with a hammer, you've got an electrical problem

    Offline Mad Max

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #38 on: June 1, 2020, 05:40:56 pm »
    Thanks for the feedback,

    The folks at Holley were super helpful when I called them up to order my Sniper package. They took a look at all the parts I picked out and set me straight on a couple fittings, and when I asked about a discount, they worked up a pretty good deal for me too.

    you bet.  Yah the Holley tech folks have been nothing short of outstanding throughout my many many calls and e-mails to fine-tune my requirements and results - all good things to say about them for sure {cool}
    2002 Dakota Quad Cab 4x4 - 440/46rh/Atlas4/D60/14b/40s
    2007 Cummins Ram 3500 Megadually 4x4 "Big Mack" - 5.9/G56
    1952 Willys M-38 "Poncho"

    Wanted:  '71 Dodge Dart Custom (4-door) - "running", all-stock restorable car in decent condition
     

                    Ö.there's always a way...

    Offline Jeffy45

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #39 on: June 16, 2020, 02:13:08 pm »
    Guss the fittings on top of the module are 3/8"to 5/16 ya just need 3/8 to 3/8
    1988 Ramcharger LE 150 318 TBI 727 non-lockup.                   
           " If a law is unjust, a man is not only right to disobey it,   
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                                                                 - Thomas Jefferson

    Offline GusChiggins86

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #40 on: June 16, 2020, 04:24:23 pm »
    Yup, I got that all squared away with the stock fittings, new hoses, & hose clamps.

    I have the supply/return lines plumbed together until I have an engine to install them on.

    No leaks so far!
    '89 Ramcharger 318/4x4/727/ 3.23 GR
    '09 Ram 1500 5.7 Hemi 4X4

    Offline Jeffy45

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #41 on: June 16, 2020, 05:24:39 pm »
    So you have a tbi , running w/ the supply and return connected into the same line???? 🤔🙃
    1988 Ramcharger LE 150 318 TBI 727 non-lockup.                   
           " If a law is unjust, a man is not only right to disobey it,   
                    he is obligated to do so"                                                   
                                                                 - Thomas Jefferson

    Offline GusChiggins86

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #42 on: June 16, 2020, 09:12:29 pm »
    I donít have an engine in the vehicle at the moment, so I just doubled the line back on itself for now so I could test the pump.
    '89 Ramcharger 318/4x4/727/ 3.23 GR
    '09 Ram 1500 5.7 Hemi 4X4

    Offline Jeffy45

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    Re: Stock fuel tank mods for efi conversion?
    « Reply #43 on: June 17, 2020, 02:11:58 am »
    Now I undestand
    1988 Ramcharger LE 150 318 TBI 727 non-lockup.                   
           " If a law is unjust, a man is not only right to disobey it,   
                    he is obligated to do so"                                                   
                                                                 - Thomas Jefferson