beautypg.com

Fuelab 54501 Fuel Pressure Regulator User Manual

Page 3

background image

Adjustment
Screw

Jam Nut

Flat Washer

Unique Serial
Number
Identification

(2X) Bracket Washer

(2X) Bracket Screw

1/8"-NPT Pressure

Reference Port

(Engine Vacuum

Typically, for EFI)

(1/8") Barbed Fitting

(can be substituted

with other fitting)

Spring Guide Ball may appear to be Off-Center,

Adjustment Screw centers this part upon installation.

-6AN Return Port

Gauge Port Plug
(can be substituted
for gauge fitting)

Example -6AN
Union Fitting Shown
(Not Supplied)

1/8"-NPT Gauge Port

Example -6AN

Union Fitting

Shown

(Not Supplied)

-6AN Inlet Port

-910 O-ring Shown,
prior to fitting
installation

Install with Cup
toward Regulator

Front
(Logo)

105020321-1, No Rev Sheet 3 of 4

4. Apply light oil onto the threads of the Adjustment Screw. Small amounts of air leakage in the adjustment

hardware may be present during operation. This is a normal operating condition. Thread the Adjustment
Screw
by hand until a slight tension is felt, this position is the minimum pressure setting. Do not tighten screw
any further. Pressure is to be adjusted later in these instructions. Install the Flat Washer, then the Jam Nut.
Tighten the Jam Nut hand tight for later adjustment.

5. Install Bracket to regulator using supplied Bracket Screws and Bracket Lock Washers. Tighten Bracket Screws

between 25-40 in·oz of torque (snug, do not over tighten screws).

6. Install the fuel fittings (not supplied). The threads used on these Fuel Ports are not tapered or pipe threads.

Do not use Teflon

®

thread tape or thread sealant on these threads, as this can cause leakage or introduce

debris into the fuel system. Fittings to be used with these style of ports require use of the enclosed–906 O-
rings
for proper sealing (reference diagrams, below). Use light oil to lubricate the O-rings just prior to
installation. Install the O-rings onto the fuel fitting first. Position the O-ring in the thread relief of the fitting as
shown in the diagram, below. Thread fitting into regulator and tighten between 5 and 15 ft·lbs of torque.

7. Use

Teflon

®

tape or thread sealant on all 1/8”-NPT fittings to be used for the Gauge Port and Pressure

Reference Port (see diagrams, below). Install fittings or plug as required. If pressure reference port is not
plumbed to the intake manifold (for typical EFI applications, port is plumbed to the intake manifold) then install
the Barbed Fitting (supplied) and allow fitting to vent to atmosphere (do not plumb or plug port).

8. Install regulator assembly into vehicle, fastening the bracket to the vehicle. Attach fuel lines, Gauge Port line (if

external pressure gauge is used in application) and Pressure Reference Port line (if applicable). Boosted
applications (such as turbo or supercharger) will require a hose clamp on barbed fitting to prevent hose from
coming loose. Use of –3AN or –4AN fitting and line can also be used as a substitute to the barbed fitting.



























9. Inspect fuel system for any contact of fuel lines or wires with other components that can cause chafing or

rubbing. Secure all components and fuel lines.

10. Connect the vehicle’s battery. Turn on fuel pump (typically by bypassing fuel pump relay) without engine

operating. ECU or engine management computer may be controlling the relay. The ECU may only operate
pump for a few seconds each time ignition switch is set to on. The pump will have to operate several seconds
(30+) to prime and drive air out of the fuel system. Fuel system pressure should read about 25 PSIG (use an
external gauge for adjustment if a permanent gauge is not used). Inspect vehicle for any leaks. Turn off fuel
system and repair any leaks that may be present before continuing.

11. When adjusting pressure, be sure that fuel pump is operating to monitor pressure. Increase pressure by

rotating adjustment clockwise. Do not thread Adjustment Screw past jam nut within 1/8”. Over tightening the
adjustment screw can damage the regulator. It is recommended to use a “baseline” pressure reference when
adjusting the pressure (adjusting the pressure with engine off or Pressure Reference Line unhooked). The
vehicle’s engine may not produce consistent vacuum during idle to have repeatable readings.

12. After final adjustment of fuel pressure, tighten Jam Nut. Road test vehicle, and retest pressure upon return to

ensure accurate adjustment.