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Thread: Using fuel pump to empty tank

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  1. #1
    Supporting Member Turbo Mopar Contributor
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    Using fuel pump to empty tank

    With the higher price of race gas this year I don't think I will be driving around on the left overs like I did last year. I also want to be as sure of the concentration in the tank as possible. I do plan on making a dual tank setup but in the mean time does anyone see any issue with me jumping the fuel pump and running the feed line to a jerry can to empty the tank? Would running for extended periods of time with no back pressure harm it or is it easier than running with pressure? I would think the latter but was curious what others thought. Thanks.

  2. #2
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    Re: Using fuel pump to empty tank

    I've done it several times. It only takes a few minutes to empty a full tank.
    “If the people of the nation understood our banking and monetary system, I believe there would be a revolution before tomorrow morning.” -Henry Ford

  3. #3
    Super Moderator Turbo Mopar Staff 135sohc's Avatar
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    Re: Using fuel pump to empty tank

    The chrysler fsm direction for emptying the gas tank involves unhooking the fuel line in the engine bay and using an extension line "to an approved container" of course while using the DRB to run the fuel pump.

    I dont see anything wrong with your method.

  4. #4
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    Re: Using fuel pump to empty tank

    No it won't hurt any thing. I like to use the fuel test port to drain the tank.

  5. #5
    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
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    Re: Using fuel pump to empty tank

    That is the best way to do it.

  6. #6
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    Re: Using fuel pump to empty tank

    DJ,
    I've been draining the fuel tanks in all my GLH's like that for 20+ years with no ill effects. Load em up with fuel for the long hibernation season and then transfer that fuel into my everyday drivers in the Spring.
    Todd

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    Buy my stuff!!!!!!!!!!! :O) Turbo Mopar Vendor turbovanman²'s Avatar
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    Re: Using fuel pump to empty tank

    That's what I used to do,
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  8. #8
    Supporting Member Turbo Mopar Contributor GLHS60's Avatar
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    Re: Using fuel pump to empty tank

    I do it all the time unless the pump is shot then use the siphon port.

    Thanks
    Randy


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  9. #9
    Supporting Member Turbo Mopar Contributor
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    Re: Using fuel pump to empty tank

    There's a siphon port?

    Thanks guys. I was pretty sure it would be fine but didn't want to take the ignorant path of burning my pump up.

  10. #10
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    Re: Using fuel pump to empty tank

    How are you guys jumping the fuel pump? I've always let the car idle and used the return line.

  11. #11
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    Re: Using fuel pump to empty tank

    Quote Originally Posted by Turbo3Iroc View Post
    How are you guys jumping the fuel pump? I've always let the car idle and used the return line.
    I cut a couple different style fuel pump electrical connectors off of some cars in the salvage yard. Tied them all together & and have about 15 feet of wiring with some alligator clips. Unplug fuel pump connector, plug in my electrical connector, attach to battery. My home made tool will drain any of my TD's. IMO, takes to long to let the car idle to drain the tank.
    Todd
    Last edited by 4 l-bodies; 08-07-2010 at 01:22 PM. Reason: changed meters to feet (duh)

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    Hybrid booster Turbo Mopar Contributor
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    Re: Using fuel pump to empty tank

    jumper wire with alligator clips. One end to battery + and one end to coil +.

    Prior to this, I unhook the rubber return line at the regulator and hook a long hose up to the regulator and over to a gas can.... or if I'm draining OLD gas, from the regulator to my truck.

  13. #13
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    Re: Using fuel pump to empty tank

    Quote Originally Posted by Turbo3Iroc View Post
    How are you guys jumping the fuel pump? I've always let the car idle and used the return line.
    I have sat and let the car idle with the return line disconnected, but it takes quite a long time. On the R/T I simply turned the ignition on and jumped the ASD relay with a spare piece of wire.

    I really like Todd's idea of having a long jumper harness. That sounds like it would be the hot ticket on an Lbody where the pump is easily accessible.
    “If the people of the nation understood our banking and monetary system, I believe there would be a revolution before tomorrow morning.” -Henry Ford

  14. #14
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    Re: Using fuel pump to empty tank

    Quote Originally Posted by 86Shelby View Post
    I have sat and let the car idle with the return line disconnected, but it takes quite a long time. On the R/T I simply turned the ignition on and jumped the ASD relay with a spare piece of wire.

    I really like Todd's idea of having a long jumper harness. That sounds like it would be the hot ticket on an Lbody where the pump is easily accessible.
    When I have had to drian fuel it hasn't ever been more than a few gallons. For a whole tank I would have been looking into something like this. Nice to know, I may try it for grins pretty soon since it it a lot more difficult on my car to get the return line off with the AN stuff. Just a placement thing.

  15. #15
    Supporting Member Turbo Mopar Contributor
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    Re: Using fuel pump to empty tank

    With my concern of the pulsing fuel when emptying the tank I pulled the pump today to take a look. I found that the pump will suck air if the canister doesn't have enough fuel in it. So when I disconnect the return line the canister doesn't stay full of fuel when the level gets lower. It does sort of "drain" fuel from the tank into the cansiter but it will only ever be as high as the tank level and the pump doesn't pull fuel through the in-tank filter off the bottom like the older ones do. I don't know how excited I am about that and it makes me want to upgrage the fuel system even more. I don't think it is an issue when the return is hooked up but the more fuel you use at the engine the less will return to keep the canister full. I couldn't see a good work around for the design. Any thoughts on it or has anyone found it to be a problem in higher HP builds?

  16. #16
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    Re: Using fuel pump to empty tank

    I cheat i use a scan tool

  17. #17
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    Re: Using fuel pump to empty tank

    I have heard of the DRB being able to do this but I have a OTC 4000E and don't know of anyway to power the pump.

  18. #18
    Supporting Member Turbo Mopar Contributor
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    Re: Using fuel pump to empty tank

    I have emptied a tank by using the pump. On my 87 GLHS I just unplugged the fuel injection harness and the pump will stay running.

  19. #19
    turbo addict Chris W's Avatar
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    Re: Using fuel pump to empty tank

    + side of battery to coil will activate the fuel pump.

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  20. #20
    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
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    Re: Using fuel pump to empty tank

    Quote Originally Posted by Chris W View Post
    + side of battery to coil will activate the fuel pump.

    Chris-TU
    That is how I do it.

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