Results 1 to 3 of 3

Thread: 5.0 Ford Fuel Pressure Regulator Installation Instructions

  1. #1
    Gils 90 Mustang Guest

    Default 5.0 Ford Fuel Pressure Regulator Installation Instructions

    First things first: Once correctly installed the regulator works just great. P/N 512-500-1. Two questions / comments:
    1. The installation instructions never even mention that the regulator must use engine vacuum to work properly. Not a big problem but not having any mention of this requirement is a bit off putting on the integrity of the product. Additionally even the drawing of the unit doesn't show hooking up vacuum.

    2. I'm using the unit on a blown (Kenny Belle) 306 with cam, heads, etc. Since there isn't any mention of vacuum should the unit get it's signal from the blown side or the vacuum side. (I'm using the vacuum side and it seems to work well.)

  2. #2
    Join Date
    Dec 2009


    If it's a boost referenced pressure regulator, the vacuum port needs to be connected to the boost side of the blower in order to proportionately increase fuel pressure under boost (1:1 boost pressure ratio). Unless you're enriching fuel, under boost, by some other means such as an FMU (Fuel Management Unit).
    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, 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.

  3. #3
    Gils 90 Mustang Guest


    Yep, I disconnected the fuel regulator from the vacuum side and connected it to the boost side and things are better: Using the computer fuel control I now have an 11.5 AFR without having to adjust the % of fuel. Makes tuning a lot easier. Thanks.

    Again, Holley, why not even a hint on what to hook up? When looking at the regulator the adjustment screw looks just like that, an adjustment screw, no indication it's also the vacuum/boost port!

    Anyway running good. I hope to take it to Woodburn Drag strip this Friday, if the weather cooperates- the forecast is rain showers but in Oregon it (the weather) can seemingly change by the hour or even by the minute.
    Last edited by Gils 90 Mustang; 05-25-2010 at 10:16 PM.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
About us
Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors have powered every NASCAR® Sprint® Cup team and nearly every NHRA® Pro–Stock champion for four decades. Now, Holley EFI is dominating the performance world as well as our products for GM's LS engine. Holley's products also include performance fuel pumps, intake manifolds & engine dress–up products for street performance, race and marine applications. As a single solution, or partnered with products from other Holley companies - Hooker Headers, Flowtech Headers, NOS Nitrous, Weiand, Earl's Performance Plumbing, or Diablosport - Holley products can give you the edge you need over the competition.
Join us