User guide

109020121-1, No Rev Sheet 3 of 6
(can be substitued
for gauge fitting)
toward Regulator
Install with Cup
Gauge Port Plug
(Logo)
can be Substituted
1/8"-NPT Gauge Port
with other fitting)
-6AN Inlet Port
Fitting (supplied
and installed,
Front
Electronics Connector
Adjustment Screw Centers this Part upon Installation.
Spring Guide Ball may appear to be Off-Center.
Screw
Jam Nut
Flat Washer
(3x) Bracket Screw
(3x) Bracket Lock Washer
Adjustment
1/8"-NPT Pressure
with other fitting)
(can be substituted
(1/8") Barbed Fitting
Unique Serial
Typically, for EFI)
(Engine Vacuum
Reference Port
Identification
Number
-6AN Return
Fitting / Valve Assy
(supplied
and Installed)
DO NOT REMOVE
OR REPLACE!
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). For mounting directly to high vibration
source such as the vehicle’s engine, use rubber vibration dampening mounts for attaching bracket to vehicle.
6. Refer to Page 5, Electrical Planning Notes. Wire provided Electrical Plug and Wire, as shown in notes. Use
solder and shrink wrap for all wire splices. Follow all instructions provided with Prodigy Fuel Pump as well,
referring to all proper electrical connections.
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). Do not use
Teflon
®
tape or thread sealant on inlet or return fittings. Return Fitting can NOT be substituted, if fitting end is
damaged, then valve assembly must be replaced.
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 15 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.