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Thread: Holley fuel pressure regulator

  1. #1
    Registered 4motion's Avatar
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    Default Holley fuel pressure regulator

    Today I installed the Holley fuel pressure regulator with gauge. My mechanic did set it to 3,5 psi, but everytime I start the engine, the gauge needle jumps around and doesn't stay near 3,5 psi at all. Guess it is because of the vibrations, but I've seen other CJ owners with similar regulators also mounted on the engine. My engine works great. No problems at all.

    Here is a short video:
    http://www.4motion.at/Jeep/MOV07384.MPG

    And some pics:

    Dodge Nitro SXT, 2.8 CRD, 2008
    Automatic Transmission, Tomgan TurboTubes, Tomgan Stainless Exhaust, Eibach Spacer, 20x7,5" Mopar Wheels, 255/50R20 Pirelli Scorpion Zero, Mopar Door Sill Guards, Katzkin Premium Leather Seats

    Jeep CJ7, 4.2L, 1985
    T150/Dana20, Sachs HD Clutch, 2,5" Rancho Suspension & 9000XL Shocks, 1" Daystar Bodylift, ASP Shackles, 15x10" Mickey Thompson Wheels, 33x12,5" BFGoodrich T/A KO, Xenon Flares,
    Weber K551 32/36 Carburetor, MeanGreen Starter, MeanGreen Alternator, D.U.I. Distributor, SSBC Performance Brakes, Goodridge Brake Lines, OEM 20 Gallon Tank, Kilby Fuel Tank Skid Plate,
    Moser 1-Piece Axles, AGR Super Box 2, AGR Super Pump, BigDaddy Steering Box Bracket, Superwinch Premium Hubs, FlamingRiver Deluxe Steering Shaft
    Paradise Island - The Online Series

  2. #2
    Registered ToddH's Avatar
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    Default

    Yeah...it's just pulsing from the pump.

    Liquid filled gauge may help some.

  3. #3
    Registered 4motion's Avatar
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    Default

    You've seen the video? So this is ok?
    Dodge Nitro SXT, 2.8 CRD, 2008
    Automatic Transmission, Tomgan TurboTubes, Tomgan Stainless Exhaust, Eibach Spacer, 20x7,5" Mopar Wheels, 255/50R20 Pirelli Scorpion Zero, Mopar Door Sill Guards, Katzkin Premium Leather Seats

    Jeep CJ7, 4.2L, 1985
    T150/Dana20, Sachs HD Clutch, 2,5" Rancho Suspension & 9000XL Shocks, 1" Daystar Bodylift, ASP Shackles, 15x10" Mickey Thompson Wheels, 33x12,5" BFGoodrich T/A KO, Xenon Flares,
    Weber K551 32/36 Carburetor, MeanGreen Starter, MeanGreen Alternator, D.U.I. Distributor, SSBC Performance Brakes, Goodridge Brake Lines, OEM 20 Gallon Tank, Kilby Fuel Tank Skid Plate,
    Moser 1-Piece Axles, AGR Super Box 2, AGR Super Pump, BigDaddy Steering Box Bracket, Superwinch Premium Hubs, FlamingRiver Deluxe Steering Shaft
    Paradise Island - The Online Series

  4. #4

    Default

    Liquid filled gauge is indeed the way to go with a pulsing source.
    Otherwise, you just figure the center of the swing (3 to 5) as the correct pressure...

    I can't believe Holley still makes a non buffered fuel gauge!
    Probably wrong application,
    For fuel injection rails so you can see pressure drop as injectors cycle instead of mechanical fuel pumps.

    BTW, if your gague drops back to zero very quicly when you shut off the engine,
    You have an issue with the inlet valve in the carb or a bad fuel pump outlet valve...

    My fuel pump/carb will hold pressure for a couple of days after you stop the engine...
    Pressure dropping after fresh carb rebuild is how I knew my fuel pump was leaking 'backwards' and making for hard starts after setting a while.
    REMEMBER!
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  5. #5
    Registered 4motion's Avatar
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    BTW, if your gague drops back to zero very quicly when you shut off the engine, You have an issue with the inlet valve in the carb or a bad fuel pump outlet valve...

    My fuel pump/carb will hold pressure for a couple of days after you stop the engine... Pressure dropping after fresh carb rebuild is how I knew my fuel pump was leaking 'backwards' and making for hard starts after setting a while.
    Hmm ... did you see the video? The gauge needle swings netweem 0 to 3,5. Yes, the gauge drops back to zero very quickly, when I shut off the engine. The fuel pump is new and the whole setup was made by a US car specialist. How do I know if there is or where is a problem?

    Maybe someone can give me a link to a correct and fitting gauge on the summit website or other websites. When I start my Jeep, I first push the throttle pedal once but I usually need 2-3 attempts to start the engine.
    Dodge Nitro SXT, 2.8 CRD, 2008
    Automatic Transmission, Tomgan TurboTubes, Tomgan Stainless Exhaust, Eibach Spacer, 20x7,5" Mopar Wheels, 255/50R20 Pirelli Scorpion Zero, Mopar Door Sill Guards, Katzkin Premium Leather Seats

    Jeep CJ7, 4.2L, 1985
    T150/Dana20, Sachs HD Clutch, 2,5" Rancho Suspension & 9000XL Shocks, 1" Daystar Bodylift, ASP Shackles, 15x10" Mickey Thompson Wheels, 33x12,5" BFGoodrich T/A KO, Xenon Flares,
    Weber K551 32/36 Carburetor, MeanGreen Starter, MeanGreen Alternator, D.U.I. Distributor, SSBC Performance Brakes, Goodridge Brake Lines, OEM 20 Gallon Tank, Kilby Fuel Tank Skid Plate,
    Moser 1-Piece Axles, AGR Super Box 2, AGR Super Pump, BigDaddy Steering Box Bracket, Superwinch Premium Hubs, FlamingRiver Deluxe Steering Shaft
    Paradise Island - The Online Series

  6. #6
    Registered 4motion's Avatar
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    Let me think. How can a fuel pressure regulator build enough pressure, if there is a fuel filter with return line in front of it? I can't adjust the Holley pressure regulator ... it always has the same pressure. My mechanic told me, that this is because of the fuel filter. But it works - the engine runs perfectly, except for the 1-3 enine starting attempts every morning.

    And this fuel return line could also be the reason the pressure on the gauge drops back to zero after turning of the engine. Or are my considerations wrong?
    Dodge Nitro SXT, 2.8 CRD, 2008
    Automatic Transmission, Tomgan TurboTubes, Tomgan Stainless Exhaust, Eibach Spacer, 20x7,5" Mopar Wheels, 255/50R20 Pirelli Scorpion Zero, Mopar Door Sill Guards, Katzkin Premium Leather Seats

    Jeep CJ7, 4.2L, 1985
    T150/Dana20, Sachs HD Clutch, 2,5" Rancho Suspension & 9000XL Shocks, 1" Daystar Bodylift, ASP Shackles, 15x10" Mickey Thompson Wheels, 33x12,5" BFGoodrich T/A KO, Xenon Flares,
    Weber K551 32/36 Carburetor, MeanGreen Starter, MeanGreen Alternator, D.U.I. Distributor, SSBC Performance Brakes, Goodridge Brake Lines, OEM 20 Gallon Tank, Kilby Fuel Tank Skid Plate,
    Moser 1-Piece Axles, AGR Super Box 2, AGR Super Pump, BigDaddy Steering Box Bracket, Superwinch Premium Hubs, FlamingRiver Deluxe Steering Shaft
    Paradise Island - The Online Series

  7. #7
    Last edited by JeepHammer; 09-01-2009 at 09:10 AM.
    REMEMBER!
    Information you got for free off the internet is worth EXACTLY what you paid for it!
    ----------------
    I used to be TeamRush, but I'm much better with medication...

  8. #8
    Registered 4motion's Avatar
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    Austria, Europe
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    Now you are putting two and two together!
    Does that mean my considerations are correct? I've once tried it with a fuel filter without return line, but this caused the fuel pump to explode. This happened two times and I don't ever want to experience this again.

    Thx for the links. I've now ordered this one: http://www.summitracing.com/parts/AED-6101/
    Last edited by 4motion; 09-01-2009 at 03:37 PM.
    Dodge Nitro SXT, 2.8 CRD, 2008
    Automatic Transmission, Tomgan TurboTubes, Tomgan Stainless Exhaust, Eibach Spacer, 20x7,5" Mopar Wheels, 255/50R20 Pirelli Scorpion Zero, Mopar Door Sill Guards, Katzkin Premium Leather Seats

    Jeep CJ7, 4.2L, 1985
    T150/Dana20, Sachs HD Clutch, 2,5" Rancho Suspension & 9000XL Shocks, 1" Daystar Bodylift, ASP Shackles, 15x10" Mickey Thompson Wheels, 33x12,5" BFGoodrich T/A KO, Xenon Flares,
    Weber K551 32/36 Carburetor, MeanGreen Starter, MeanGreen Alternator, D.U.I. Distributor, SSBC Performance Brakes, Goodridge Brake Lines, OEM 20 Gallon Tank, Kilby Fuel Tank Skid Plate,
    Moser 1-Piece Axles, AGR Super Box 2, AGR Super Pump, BigDaddy Steering Box Bracket, Superwinch Premium Hubs, FlamingRiver Deluxe Steering Shaft
    Paradise Island - The Online Series

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