Primer/Booster Fuel Pump
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Primer/Booster Fuel Pump

  1. #1
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    Default Primer/Booster Fuel Pump

    Trying to help a Bud of mine... He has an old school Schiada that has a naturally aspirated 454 CI motor that has a mild cam ( about 500 HP ) Anyway, he runs a mechanical fuel pump and due to the stock fuel delivery it takes about 30 to 40 seconds to fire after a 24 hour sit..somebody told him that he can run an electric primer/booster pump between the mechanical pump and the carb to prime fuel into the bowls to cut down on the cold cranking time to fire the motor. Anyone hear of this? I suppose you could run an electrical in-line pump with a manual switch but would this impede normal fuel flow between the mechanical to the electric to the carb? Thanks in advance!

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  3. #2
    gn7
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    What happens to the fuel in the bowls in 24 hrs? Even in Havasu in the dead of summer the bowls have enough fuel in them to start an engine.



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    No clue other than the configuration of the fuel lines could be sucking or sphyoning the fuel from the bowls. From the carb the lines go straight down (vertical) to a fuel/water separator then goes straight down again to the fuel pump

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    Quote Originally Posted by gn7 View Post
    What happens to the fuel in the bowls in 24 hrs? Even in Havasu in the dead of summer the bowls have enough fuel in them to start an engine.


    Bob's right. The fuel has to be going somewhere overnight. If one didn't want to figure out where its going, you could just put a one-way check valve in the fuel feed line. Jocko

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    gn7
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    Quote Originally Posted by jockorace View Post

    Bob's right. The fuel has to be going somewhere overnight. If one didn't want to figure out where its going, you could just put a one-way check valve in the fuel feed line. Jocko
    you can't siphone fuel thru the needle and seat. A check won't solve anythng.
    What carb is on the thing?



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    It has a Rochester quadrojet...I have been around the boat for 25 years and it is always hard to start after sitting. just put a new Holly high performance mechanical pump on it and no difference

  9. #7
    gn7
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    Quote Originally Posted by Zzyzzx View Post
    It has a Rochester quadrojet...I have been around the boat for 25 years and it is always hard to start after sitting. just put a new Holly high performance mechanical pump on it and no difference
    It didn't help because its not a fuel pump problem.



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  10. #8
    Or Seth, either one Budweiser's Avatar
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    On Quadrajet carbs, there are plugs that are known to leak, causing various problems. The plugs are needed to seal the ends of drilled/machined passageways/circuits that supply fuel throughout the carburetor, and sometimes they just leak. They are located between the main body and the throttle plate, on the bottom of the main body.

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    Here's a pretty good write-up on the solution. It addresses a different performance issue, however it's most likely the remedy for your situation too.
    Home Remedy Quadrajet Carburetor - High Performance Pontiac Magazine

    There's some misleading internet information about fuel siphoning out of a Quadrajet carb through the fuel line. In actuality, it is possible, however it's nearly impossible. For this to happen, the screw in seat (of the needle and seat assembly) must be installed incorrectly/not screwed all the way down, the check valve in the fuel filter must fail, and the check valve in the fuel pump must fail... all at the same time. Otherwise, there's really no way for fuel to siphon out of the carburetor and back down the fuel line.

    The article above should solve your issue. Probably gonna say "damn, I wish we figured this out 25 years ago" LOL

    Good luck!
    -Seth-
    Last edited by Budweiser; 05-07-2013 at 06:45 PM.

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    gn7
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    the installation of a Holley would fix what ever problem your having right up.



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  12. #10
    Or Seth, either one Budweiser's Avatar
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    OR...






    Never mind.

    Wouldn't want to steal Beer30's catchphrase.

  13. #11
    gn7
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    Quote Originally Posted by Budweiser View Post
    OR...






    Never mind.

    Wouldn't want to steal Beer30's catchphrase.
    Thanks Budweiser, my monitor was due for a cleaning



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    Just got done cleaning mine...

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