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Thread: 12-803 Fuel Pressure Regulator Issues

  1. #1

    Default 12-803 Fuel Pressure Regulator Issues

    I'm using a Holley Blue pump & the regulator to supply fuel for my NOS system.

    The regulator is good for 4.5-9 psi, according to Holley. I'm looking for 5.5 psi.
    When I went to set this up at 9 psi, the regulator was fine, but when I dropped it to 5.5, the needle
    on my setup gauge was bouncing and unsteady and you could here the regulator making a noise.

    I left it as is, but it was still a concern.

    The pump/regulator have never been used until this weekend.

    Any ideas on what to do to fix this fluctuating issue? Thanks.

  2. #2
    Join Date
    Dec 2009


    This may or may not help you, but I thought I should post it anyway:
    (Related Forum Thread)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 3G alternator, Optima Red battery, R134a A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

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