Author Topic: fuel tank and bumper  (Read 2127 times)

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Offline flyfish

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fuel tank and bumper
« on: August 11, 2017, 06:21:38 pm »
Sorry for the long post. I've mentioned it in a couple of other threads but decided to put it here along with pics to get feedback from you guys.
I mocked up the tank I'm looking to purchase and I have some concerns that are bugging me though I will probably proceed with it verses the stock tank that would cost me to refabricate my exhaust among other things.
So as I researched ideas on putting the tank behind the rear axle and of course stumbled across all the jeep recalls and the famous pinto/bobcat stories and all the fiery crash pictures that go along with it. I'd like to minimize the chance of fire/explosion.
Right now I have a Durango bumper on the back of my utiline that I just haven't bothered changing-it's early 2000's so it has better strength than the factory bumper. As pictured, the tank is 10 inches from the end of the frame rails and 17inches from the outer rear edge of the bumper. The height is just a little above the axle-hard to see in pic with truck backed up near the wall.
The tank has a large flange that rest on the bottom edge of the frame rail but I would likely build some type of reinforcement/cage as well. Right now there's a temporary cell in the bed.

Some thoughts I had:
1: use something like the chrysler solution to the recall on the jeeps and use a trailer hitch type device to further protect that area. Instead of shaping as a square I was thinking of shaping it something like \_/ where an impact would try to push the frame apart outward.
2: IF I can make it work- an angled skid plate that would deflect impact.
3: just leave it as is.

Even if rear-ended I know an explosion is not imminent but I know it's happened. Seems like all the old cars had tanks under the trunk. What do you guys think?

correction: I have a dakota bumper not durango


« Last Edit: August 11, 2017, 08:39:50 pm by flyfish »
'78 D150 w/ '68 440- street machine. Edelbrock RPM heads & intake. Edelbrock 800 performer carb. 8.75 rear.

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    Offline flyfish

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    Re: fuel tank and bumper
    « Reply #1 on: August 11, 2017, 06:41:13 pm »
    here's what got me started in all this mess...see the support rot-it's much worse in other areas. I have another set from a donor I'm going to put on that I've cleaned up real nice..then I'm going to need new bed wood...see how all this snowballs :)
    "well if I'm doing this I might as well do that...etc. etc. " you know how it goes
    '78 D150 w/ '68 440- street machine. Edelbrock RPM heads & intake. Edelbrock 800 performer carb. 8.75 rear.

    Offline SuperBurban

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    Re: fuel tank and bumper
    « Reply #2 on: August 11, 2017, 06:42:18 pm »
    From what I can see, it looks like a great way to go. My main concern would be how the tank is mounted. It should be mounted to the frame, not with brackets holding it against the bottom of the bed. Also secure agains any rubbing of the mounts, and tank.

    My main worry, would be hitting the tank against something (curb, rock ect). A good receiver hitch, and a cross member, and plate would help that.

    Accident? I have been rear ended several times, and not had any more then the bumper bent. The frame is stronger then any car, and the strength is in the frame, not a unibody. The truck will get pushed forward, before any real bending will happen to the frame.
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    Offline flyfish

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    Re: fuel tank and bumper
    « Reply #3 on: August 11, 2017, 07:37:05 pm »
    Thank you Super! Yea the new tank will be mounted to frame. I had thought of the skid plate from u2slow in another thread. I've only driven around the block with the tank in the bed as it is now...that was just a temporary setup during restoration. Like you said with the weight of that fuel attaching to a bed is not sufficient. When I considered keeping it in the bed I was going to cut holes and have a brace going through the wood bed to the frame. I just really want to get that block of aluminum out of the bed. The tops of some of the crossmembers are only held together by undercoating-thankfully the large riveted ones are in really good shape.   
    '78 D150 w/ '68 440- street machine. Edelbrock RPM heads & intake. Edelbrock 800 performer carb. 8.75 rear.

    Offline 1Asterisk

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    Re: fuel tank and bumper
    « Reply #4 on: October 6, 2017, 08:09:36 am »
    I just came across this and I don't know if it will be of any value with your project, but I mounted a new aftermarket 22 gal fuel tank for a 70's Mustang between the rear frame rails of my 73 D100 Utiline. No modifications to the frame rails excelpt to drill [4] mounting holes for the tank frame to mount to the rails. The Ford float sender for this tank is of the same resitance as the stock 73 Utiline fuel gauge, though I am using aftermarket instruments. Apparently this is a popular mod with 50's era Ford PU projects to get the original fuel tank out of the cab. My project is not yet completed, so this setup is yet to be tested. Here's a couple of photos -

    Note - I have side exhausts so modifying an original exhaust system was not an issue.

    « Last Edit: October 6, 2017, 08:16:43 am by 1Asterisk »

    Offline flyfish

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    Re: fuel tank and bumper
    « Reply #5 on: October 6, 2017, 09:51:26 pm »
    The second picture (tubing) did you fabricate? I need to research the frame width on a 73 vs. a 78 but I'm thinking they should be the same or close. I'm interested in knowing. The one I'm considering (and mocked up in the pics) is for a chevy pickup though I can't recall the year but it's from this comany
    https://www.azproperformance.com/Boyd-Welding-Aluminum-Gas-Tank-Carb-Bed-Fill-14001.html
    They have it setup to where you can add the in tank pump...something I'm not going to do right away but if I ever wanted to go FI later, it would be an easy transition.
    edit: I have the speedhut gauges and the fuel gauge is programmable so my only concern is dimensions
    « Last Edit: October 6, 2017, 09:53:26 pm by flyfish »
    '78 D150 w/ '68 440- street machine. Edelbrock RPM heads & intake. Edelbrock 800 performer carb. 8.75 rear.

    Offline flyfish

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    Re: fuel tank and bumper
    « Reply #6 on: October 6, 2017, 10:21:46 pm »
    Initially I failed to notice you were working on a utiline like I am (78 LRE). I bought the back half of a utline to restore my bed and just cleaned up/de-rust all the rails that go across the bed. I'm waiting on paint to be delivered. If you post any further pics/threads on your restoration I'l be watching for sure. After the fuel tank I'm deciding on the bed wood.
    '78 D150 w/ '68 440- street machine. Edelbrock RPM heads & intake. Edelbrock 800 performer carb. 8.75 rear.

    Offline 1Asterisk

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    Re: fuel tank and bumper
    « Reply #7 on: October 7, 2017, 06:31:02 am »
    The second picture (tubing) did you fabricate? I need to research the frame width on a 73 vs. a 78 but I'm thinking they should be the same or close. I'm interested in knowing.

    edit: I have the speedhut gauges and the fuel gauge is programmable so my only concern is dimensions


    Flyfish - I did fabricate the tube frame. The Mustang tank has a mounting flange all the way around the outer circumference. The tank fits inside the tubular frame and attaches to it. The tubular frame then mounts to the frame rails with 4 bolts. I would think the frame dimensions would be the same 73-78, but I can take some measurements if you need them.

    I have a build thread with a few photos on another site at this link http://www.dodgetalk.com/forums/showthread.php?t=375361 though you have to be registered to access the photos. I also have a short thread on the fuel tank install at this link http://www.dodgetalk.com/forums/showthread.php?t=477250&highlight= .


    Offline flyfish

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    Re: fuel tank and bumper
    « Reply #8 on: October 8, 2017, 06:03:33 pm »
    Thanks. I'll see what I need to do to check out your thread on the other site
    '78 D150 w/ '68 440- street machine. Edelbrock RPM heads & intake. Edelbrock 800 performer carb. 8.75 rear.