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Thread: fuel pump bypass

  1. #1
    Senior Member EXPERT BUILDER
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    fuel pump bypass

    car is langing just before shift, has anyone had a problem with bypass lang with a rear electric pump? i'm thinking about blocking off bypass to see if that stops the problem.it's a 402bb 1.76 glide 5000 stall 488 rear on alky leaving at 3200 & shifting at 6000 was leaving at 3600 & shifting at 6500 made no differance except slow the car down of coarse.any help would be great cause i'm runnin out of thoughts . thanks guys

  2. #2
    Senior Member EXPERT BUILDER
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    anybody out there???????????? :cry:

  3. #3
    Senior Member RACING JUNKIE
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    Re: fuel pump bypass

    Quote Originally Posted by john858
    car is langing just before shift, has anyone had a problem with bypass lang with a rear electric pump? i'm thinking about blocking off bypass to see if that stops the problem.it's a 402bb 1.76 glide 5000 stall 488 rear on alky leaving at 3200 & shifting at 6000 was leaving at 3600 & shifting at 6500 made no differance except slow the car down of coarse.any help would be great cause i'm runnin out of thoughts . thanks guys

    Explain the fuel system what pump and pressure you running ?
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines
    www.apdracing.com

  4. #4
    Senior Member MASTER BUILDER
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    Also give us a time slip info and how heavy it is....

  5. #5
    Senior Member EXPERT BUILDER
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    we are running electic from the rear,i think it's pro. products,but this weekend i went ahead & block the bypass off to see if that would help,that seem to take care of the problem. car's 2900 with driver it was losing time in the 330' just before it shifted,we are running about 8# of pressure.the bypass is in the pump. reg.is about 12" from carb.could the regulatar cause a flow problem also? i just have a cheap holley reg. on it.thanks for any help.
    john

  6. #6
    Senior Member MASTER BUILDER
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    Sounds like the regulator....I have the large BG regulator. You also need to get it close to the carb from what Im told....Here's a pick of the way I have mine set up....

  7. #7
    Senior Member EXPERT BUILDER
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    thanks sg1586 thats another thing i was going to do just to be safe.

  8. #8
    Senior Member MASTER BUILDER
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    regulator

    Nice bracket for the regulator, Who makes it?

  9. #9
    Senior Member RACING JUNKIE
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    Re: fuel pump bypass

    Quote Originally Posted by john858
    car is langing just before shift, has anyone had a problem with bypass lang with a rear electric pump? i'm thinking about blocking off bypass to see if that stops the problem.it's a 402bb 1.76 glide 5000 stall 488 rear on alky leaving at 3200 & shifting at 6000 was leaving at 3600 & shifting at 6500 made no differance except slow the car down of coarse.any help would be great cause i'm runnin out of thoughts . thanks guys
    Check your fuel pressure from the pump to the regulator, It should be around 20 psi. If so the pump is not your problem.
    1. You need 11.9 volts or more at all times for a high flow pump.
    2.With alcohol I'd run 12an to the pump and a 10 an to the regulator and 8an to carb. Step down 2 between each.
    3. A good regulator is a must have.
    4. Run fuel out of both sides of your regulator not out of just one side.
    5. Make sure your fuel bowl level isn't low.
    6. If your running a filter(should be 100 micron stainless) check to see if its not getting plugged.
    7. Make sure your using a relay on a high flow pump.
    8. Make sure your not cavitating your fuel in the tank as it returns. High flow pumps return more fuel than you might think. I run foam in my cell.
    9. If you have any water in your alcohol it will do that also.
    Just a check list to help you out.
    take care and good luck.

  10. #10
    Senior Member MASTER BUILDER
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    Re: regulator

    Quote Originally Posted by topcat572
    Nice bracket for the regulator, Who makes it?


    http://www.competitionmotorsports.us/fuel_brackets.php

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