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Thread: Using fuel pump to empty tank

  1. #1
    Authorized Vendor Turbo Mopar Vendor
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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.
    DJ
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  2. #2
    Supporting Member II Turbo Mopar Contributor
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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.
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    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.

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    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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    Re: Using fuel pump to empty tank

    That's what I used to do,
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    Supporting Member II 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
    Authorized Vendor Turbo Mopar Vendor
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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.
    DJ
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  10. #10
    turbo addict Turbo Mopar Contributor
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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

    I cheat i use a scan tool

  12. #12
    turbo addict Turbo Mopar Contributor
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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.

  13. #13
    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.

  14. #14
    Authorized Vendor Turbo Mopar Vendor 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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    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.

  16. #16
    turbo addict Turbo Mopar Contributor
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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
    Does it work on a TIII car?

  17. #17
    See me ride out of the sunset... Turbo Mopar Staff BadAssPerformance'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
    Good to know.

    I usually disconnect the injector harness and cycle the ignition key to "run" and it latches the fuel pump to stay on. ... works on LM and SMEC cars, not sure on SBEC or newer.

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  18. #18
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    Re: Using fuel pump to empty tank

    Quote Originally Posted by Turbo3Iroc View Post
    Does it work on a TIII car?
    Do the TIII cars give power to the coil via the Z1(?) circuit that the fuel pump is on? If so it should still work.


    Quote Originally Posted by BadAssPerformance View Post
    Good to know.

    I usually disconnect the injector harness and cycle the ignition key to "run" and it latches the fuel pump to stay on. ... works on LM and SMEC cars, not sure on SBEC or newer.
    I did not know that. Thanks for that tip.

  19. #19
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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)

  20. #20
    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.

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