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Thread: L body fuel system upgrade

  1. #1
    Hybrid booster Turbo Mopar Contributor Skibbe's Avatar
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    L body fuel system upgrade

    Anyone have some ideas on mounting a fuel cell in an L body?

    The time has come to retire the Walbro in-tank and stock lines/rail. I've got a few parts on the shelf already, like a S60 pump and -6 feed that I'll probably be using. I'll upgrade the rail, and then swap from a rail mounted AFPR to an Aeromotive AFPR also, as I can run AN fittings and braded line on everything.

    So, I'm trying to decide what to do for a fuel tank. I'm not ready to go race only, so I don't want to go with a small 3gal cell up front. It would be convenient to drop something in the spare tire well, but I don't think it would pass tech without some sort of vented enclosure seperating the hatch area from the driver. I could cut out the spare tire well, and sheet over it, and then mount a cell underneath that area.

    I also have a new stock tank on hand, but don't know if putting a sump on it will end up being too low. The S60 pump came out of another charger that just had the pump mounted externally, and then the inlet plumbed to a piece of rubber tubing laying on the bottom of the tank. Pumps are designed to push, not pull, so that is not something I want to duplicate.

  2. #2
    See me ride out of the sunset... Turbo Mopar Staff BadAssPerformance's Avatar
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    Re: L body fuel system upgrade

    You can put it in the spare tire well if you have a firewall over it like I got

    EDIT: 5 gallon...


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  3. #3
    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
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    Re: L body fuel system upgrade

    I know that AM welded a piece to the tank on their talon which allowed them to run everything off of the stock tank. that seems like the way to go.

  4. #4
    Hoosier Daddy?? Turbo Mopar Staff Clay's Avatar
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    Re: L body fuel system upgrade

    what do you run for a firewall JT?
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  5. #5
    Super Moderator Turbo Mopar Staff contraption22's Avatar
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    Re: L body fuel system upgrade

    Doesn't it it have a negative impact on traction to move the fuel tank from in front of the rear axle to behind it?
    Mike Marra
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  6. #6
    Hybrid booster Turbo Mopar Contributor Skibbe's Avatar
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    Re: L body fuel system upgrade

    Quote Originally Posted by contraption22 View Post
    Doesn't it it have a negative impact on traction to move the fuel tank from in front of the rear axle to behind it?
    Yeah, which would be one argument for modifying the stock tank.

    In JT's case though, his car is a pig no matter where that weight is... and 5 gallons at least weighs less than the 12.5(?) gal stock tank.

    Is anyone running a S60 style pump on the stock tank? Without having a two pump set-up?

  7. #7
    See me ride out of the sunset... Turbo Mopar Staff BadAssPerformance's Avatar
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    Re: L body fuel system upgrade

    Quote Originally Posted by Clay View Post
    what do you run for a firewall JT?
    .030 aluminum or whatever the rules say... I'll find a pic.

    JT
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  8. #8
    Super Moderator Turbo Mopar Staff contraption22's Avatar
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    Re: L body fuel system upgrade

    Quote Originally Posted by Skibbe View Post

    Is anyone running a S60 style pump on the stock tank? Without having a two pump set-up?

    Im running a S60 pump with a carb'd tank. Works pretty good... as long as I have more than 1/4 tank of gas.
    Mike Marra
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  9. #9
    Hybrid booster Turbo Mopar Contributor Skibbe's Avatar
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    Re: L body fuel system upgrade

    Quote Originally Posted by contraption22 View Post
    Im running a S60 pump with a carb'd tank. Works pretty good... as long as I have more than 1/4 tank of gas.
    How is it set up to draw fuel from the tank? I assume its all downhill from the tank to the pump?

  10. #10
    Super Moderator Turbo Mopar Staff contraption22's Avatar
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    Re: L body fuel system upgrade

    Quote Originally Posted by Skibbe View Post
    How is it set up to draw fuel from the tank? I assume its all downhill from the tank to the pump?
    Nope,, actually the pump is above the tank. Its not an ideal situation, but it hasn't become a problem yet. I really have been meaning to swap in a TBI tank and turbo pump.
    Mike Marra
    1986 Plymouth Horizon GLMF "The Contraption" < entertaining sponsorship offers
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  11. #11
    Hybrid booster Turbo Mopar Contributor Skibbe's Avatar
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    Re: L body fuel system upgrade

    Maybe I'm worried about it too much. That's the same way this S60 pump was mounted when I pulled it.

  12. #12
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    Re: L body fuel system upgrade

    I kinda like the idea of the carbed pump with an external, but I suppose it would help if one could get the pump mounted in a lower position to try to get the siphoning effect. There are some really good external pumps out there that don't cost an arm and a leg. My friend found that when he was modding anything on his 67 Nova that if you wanted to reuse what you had it always ended up costing more to do it that way then starting from scratch. That may no apply here, but just a thought.
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  13. #13
    Hybrid booster Turbo Mopar Contributor Skibbe's Avatar
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    Re: L body fuel system upgrade

    Ok, I'm going to order a weld-in sump from Competition Engineering through Summit. I already have a new L-body tank on hand, so now is the time to weld something to it.



    Looks like I have a choice of 1/2" NPT and 3/8" NPT for the bungs, and will probably just go with the 1/2". -8 feed and -6 return should give plenty of fuel for my set-up.

  14. #14

    Cool Re: L body fuel system upgrade

    Quote Originally Posted by Skibbe View Post
    Is anyone running a S60 style pump on the stock tank? Without having a two pump set-up?
    I have one in my Omni. I had to split the pickup assembly into two sections so I could get the pump through the hole. I put flare couplers on the tubes and reconnect them after the pump is inside. Been using it for about 10 years, never had a problem.

  15. #15
    Super Moderator Turbo Mopar Staff contraption22's Avatar
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    Re: L body fuel system upgrade

    Quote Originally Posted by Skibbe View Post
    Ok, I'm going to order a weld-in sump from Competition Engineering through Summit. I already have a new L-body tank on hand, so now is the time to weld something to it.



    Looks like I have a choice of 1/2" NPT and 3/8" NPT for the bungs, and will probably just go with the 1/2". -8 feed and -6 return should give plenty of fuel for my set-up.
    A little tip... instead of cutting out the whole square or rectangle to put the sump in, mark the area and use a hole saw to cut a bunch of 1" holes in the area covered by the sump. It acts like a cheap baffle. Also be careful of the placement of the sump, as the rear axle beam is pretty close to the rear of the tank.
    Mike Marra
    1986 Plymouth Horizon GLMF "The Contraption" < entertaining sponsorship offers
    Project Log:
    http://www.turbo-mopar.com/forums/showthread.php?69708-The-Contraption-2013-14&highlight=

  16. #16
    See me ride out of the sunset... Turbo Mopar Staff BadAssPerformance's Avatar
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    Re: L body fuel system upgrade

    Quote Originally Posted by Skibbe View Post
    Ok, I'm going to order a weld-in sump from Competition Engineering through Summit. I already have a new L-body tank on hand, so now is the time to weld something to it.



    Looks like I have a choice of 1/2" NPT and 3/8" NPT for the bungs, and will probably just go with the 1/2". -8 feed and -6 return should give plenty of fuel for my set-up.
    Nice sump... let me know when you need it welded in.

    JT
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  17. #17
    Hybrid booster Turbo Mopar Contributor Skibbe's Avatar
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    Re: L body fuel system upgrade

    Well, the sump was cheap compared to the $300 of braided line and fittings I ordered to go with it.

    Picked up a -8 inline Fuel Filter too. FWDperf is currently out of the fuel rails, but it will take me a little while to get everything else together first anyway.

  18. #18
    Hybrid booster Turbo Mopar Contributor Skibbe's Avatar
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    Re: L body fuel system upgrade

    Ok, two years later...

    Was playing with the sump today. I can get the fittings to clear the rear axle without any issues. Definitely not going to be able to get the pump lower or level with the sump very easily. Thinking about putting a bracket where the current external pump is (1986 two pump set-up currently...)





    Anyone think this will cause issues, either with pump priming on start up, or cavitation later? Does it defeat the purpose of the sump?

  19. #19
    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
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    Re: L body fuel system upgrade

    How low does that sump sit when the car is on the ground? Perhaps it's just the angle, but I would be worried about something ripping off the lines if I went over it. Obviously that could be avoided wit proper routing I suppose.

  20. #20
    Hybrid booster Turbo Mopar Contributor Skibbe's Avatar
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    Re: L body fuel system upgrade

    About 2" lower than a stock tank. ;-)

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