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Thread: Fuel pump...

  1. #1
    Supporting Member Turbo Mopar Contributor GLHS60's Avatar
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    Fuel pump...

    Anyone running an in tank TBI fuel pump supplying say a Walbro 255 in our cars??

    Low pressure pump feeding a high pressure unit.

    Thanks
    Randy


    There is no logical reason to call an Engine a motor.

    Randy Hicks
    86 GLHS60
    86 GLHS 373 : SOLD, but never forgotten
    89 Turbo Minivan
    83 Turbo Rampage : SOLD
    Edmonton,Alberta,Canada

  2. #2
    turbo addict
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    Re: Fuel pump...

    Why? Most people get rid of the two fuel pump system in l body first chance they get.

  3. #3
    turbo addict
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    Re: Fuel pump...

    Randy,
    Yes I have done that in my 85 GLHT. Running 88-90 TBI assembly in-tank feeding into Bosch 041? pump. Been like that for 20 years or so. I noticed the old stock Bosch external pumps on the L-bodies were very high pressure. It would peg a 120 PSI gauge instantaneously when squeezing return line briefly. For a while I ran a TBI internal pump feeding the stock Bosch external one too. Did this when my internal priming pump failed. That seemed to work very well too. Either set-up was overkill for my 280 HP log manifold car.
    Todd

  4. #4
    Supporting Member Turbo Mopar Contributor GLHS60's Avatar
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    Re: Fuel pump...

    Hey Todd:

    I appreciate your experienced reply!!

    Wayne is considering using a 1994 pump module in Mean Mini to try and eliminate low fuel level starvation at launch.

    The intank module is supposed to have better low fuel level starvation qualities than a baffle.

    I encouraged him to give it a try as the module has the ingenious jet pump built in.

    Like you I never had an issue with the L body dual pump system but many were changed via TSB??.

    I don't even remember why but I don't think it was reliability, was it??

    Thanks
    Randy


    There is no logical reason to call an Engine a motor.

    Randy Hicks
    86 GLHS60
    86 GLHS 373 : SOLD, but never forgotten
    89 Turbo Minivan
    83 Turbo Rampage : SOLD
    Edmonton,Alberta,Canada

  5. #5
    Slugmobile & MeanMini Caretaker Turbo Mopar Contributor wheming's Avatar
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    Re: Fuel pump...

    I agree that the design looks like an improvement with many sound benefits.
    The problems i've identified with trying to use one may vary depending on brand but:

    The Spectra Premium one does not appear to come apart alowing the replacement of the actual electric pump from the module canister.

    In using one, and replacing the electric pump witha higher output unit, what sizing do you need to step up to to ensure proper fuel flow at your injector rail? - the jet action requires some flow from the pump discharge to be bypassed through the venturi for the jet suction effect.

    I don't know how you would then spec out your pump flow capacity.
    Wayne H.

    '91 Dodge Spirit ES 2.5L turbo 5spd
    '05 PT GT 2.4T HO autostick (RIP)
    '89 Plymouth Acclaim 2.5L turbo auto, "Slugmobile" yes, THE Slugmobile!
    '89 Dodge Caravan SE 2.5L turbo auto, "Mean Mini" yes, Gus' Mean Mini! (Current best 11.699 @ 114.43 mph! - Oct 15th, 2022 Cecil County Dragway, MD)
    MeanMini dragracing videos: https://www.youtube.com/playlist?lis...URZLB1RxGYF6vw
    and other cars, trucks and motorcycles
    https://www.youtube.com/user/SlugmobileMeanMini

  6. #6
    turbo addict
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    Re: Fuel pump...

    Randy,
    I was always under the impression that many L-body pumps were replaced due to excessive noise and not reliability issues. I actually had a parts guy tell me they would replace mine at no charge if I complained a little about the noise to the service manager. Of course this was when car was only a couple/few years old. Never did, because my cars was fairly modified at that point, and I didn't want techs out beatin on my car. You know they would have.
    I once acquired a GLHT that was not running for like 10+ years. Upon fixing all the previous owners attempts at getting it running, at startup the external pump had a steady fast drip coming out of body of pump. Within 30 minutes, gaskets swelled and never leaked a drop again! I like parts that repair themselves (lol).
    Todd

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