• Adjustable Fuel Pressure Regulator Question
  • Adjustable Fuel Pressure Regulator Question
  • Adjustable Fuel Pressure Regulator Question
  • Adjustable Fuel Pressure Regulator Question

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  1. #1
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    1984 two-tone bronze
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    Default Adjustable Fuel Pressure Regulator Question

    Making good progress bringing my 84 back to life. After rebuilding both TB's, installing a new 85 pump and new sending unit, replacing all rubber sections of fuel and return lines, flushing all lines with carb cleaner, converting to an adjustable pressure regulator, and installing a fuel pressure guage, we fired the car today and it ran nicely.

    Now the question: When it first fired, pressure was at 8-9 lbs and tab was just about halfway up the slot in the regulator housing. I began adjusting pressure while engine was running, and it rose slowly until it reached 12 psi and went no further. I checked the tab again, and it was all the way at the top of the slot, with no further adjustment available. This was not what I expected.

    Anyone have experience with this, and can offer observations or advice?

    Also, the front injector had a nice spray pattern, but the rear had a poor pattern and after a few minutes developed a drip and was obviously restricted. I'l remove the rear injector and clean again. Any adice on home injector cleaning remedies appreciated. Thanks.

  2. #2
    Moderator KANE's Avatar
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    Dark Blue 1982 Trans Am(s): Polo Green 1995 MN6
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    Fuel pressure is in part a function of the overall output of the pump itself.

    The OEM TBI pumps will crank out between 12 -15 PSI max. If you find you need more because of mods, you will need to go to a higher flowing fuel pump, like the 85 & up TPI cars had. I have about 20psi on my rail with an 85 Vette fuel pump.

    Hope that helps other folks too...
    1982 Dark Blue Corvette
    Crossfire Injection | .496"/.495" Cam | AFR Eliminator Heads | EBL | 3.73
    0-60mph in four and a half seconds



    1995 Trans Am
    1 of 1 Trans Am | 100% documented | RPOs 48U, MN6, and GU6
    1982 Chevrolet Corvette , 350 2k RPM Stall Converter + Updgraded Transmission + Governor Set For 5,450rpm Shifts 3.73 Code 42 Dark Mettalic Blue with a twist

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