Mallory Ignition Mallory FUEL PRESSURE REGULATOR 4213 - Manual

FUEL PRESSURE REGULATOR
Part No. 4213
INSTALLATION INSTRUCTIONS
®
FORM 1459-01 (REV. B) 7/99
INSTALLATION
Mallory's 4213 Adjustable Fuel Pressure Regulator is designed to be a bolt-
on replacement for the OEM Ford 1994-1998 5.0 and 4.6 fuel injection
regulator (except 1998 SOHC). The Mallory Regulator is installed in the
same manner as the factory Ford regulator (see repair manual). Be sure to
lubricate the O-rings with a drop or two of motor oil before installation.
VACUUM PORT
A vacuum line is connected to the stock regulator. This vacuum line should
be connected to the vacuum port on the Mallory regulator to reduce fuel
pressure at idle and part throttle.
SETTING THE PRESSURE
Factory Ford regulators produce about 35-40 psi at full throttle. The Mallory
regulator is factory set at about 45 psi. Adjust the pressure by loosening the
jam nut and turning the adjustment screw (clockwise increases pressure).
The full throttle pressure can be adjusted between about 30 and 75 psi. The
ideal pressure depends on many variables. On a mostly stock engine, a
slightly higher pressure (about 45 psi) will usually result in a slight power
increase. Modified engines may require higher pressures to optimize power
output. If a pressure over 60 psi is required to optimize power output, larger
injectors should be considered.
FUEL PRESSURE GAUGE PORT
A 1/8 NPT port is tapped into the side of the Mallory regulator housing. The
port is supplied from Mallory with a plug. If a fuel pressure gauge is used, the
plug can be removed and the gauge connected to the port.
REBUILDING
See Figure 2
If the regulator develops a leak or the pressure begins to fluctuate, rebuilding
may be necessary. A rebuild kit is available (Part No. 3162). This kit includes
a new diaphragm assembly, sealing washer, gasket and O-rings. The
diaphragm and sealing washer can be replaced without removing the
regulator housing.
REPLACING THE DIAPHRAGM
AND SEALING WASHER
Remove the nut and adjustment screw. Remove the three upper screws.
Remove the cap, thrust washer, springs, diaphragm assembly and the
sealing washer. Install the new sealing washer and diaphragm assembly.
Re-install the springs, washer, and cap. Re-install the three screws. Great
care must be taken to tighten the screws gradually and evenly so that the
cap stays flat with the housing.
REPLACING THE GASKET AND O-RING
If replacing the diaphragm and sealing washer does not help, it may be
necessary to replace the gasket and O-rings. Remove the regulator from the
fuel rail and replace the gasket and O-rings. Be sure to lubricate the O-rings
with a drop or two of motor oil before re-installing.
O-RINGS O-RINGS
VACUUM PORT VACUUM PORT
PORT PORT
GAUGE GAUGE
GASKET GASKET
ADJUSTMENT SCREW ADJUSTMENT SCREW
JAM NUT JAM NUT
FIGURE 1