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Thread: Pressure Falling

  1. #1

    Default Pressure Falling

    I'm running a Holley Blue pump with the regulator that came with it (803). Is one side a bypass and the other the carb supply? I have it plumbed with each side of the regulator going to each fuel bowl inlet. The problem I'm having it after running for 5 minutes, one side steadily drops in pressure until it eventually hits 0 psi. Never had this problem before with my last Blue pump & regulator setup.

  2. #2
    Join Date
    Nov 2013
    Location
    Chicago IL
    Posts
    1,959

    Default

    This sounds like what happens when you get vapor lock.
    You may need to run a bleed line that goes from the fuel bowl back to the tank.
    Typically a small line (like a -3AN nitrous line) with a .020"-.040" jet in it will be plenty.
    There are also several bleed kits available on the market, that you can add to just about any carburetor.
    -Scott
    Don't forget to check out progress on my Race Car:
    Project Blasphemy - 8.07 @ 171
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  3. #3

    Default

    I've never run into a vapor lock with an electric fuel pump. So you are suggesting a return line? You say from the bowl, do you mean the regulator?

  4. #4
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    17,661

    Default

    He is actually referring to a bleed line (research it). However, I prefer a return style fuel pressure regulator.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

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