Fuel Filter/Pressure Regulator; Description; Operation; Removal - Chrysler Vehicle User Manual

14 - 4 FUEL DELIVERY
FUEL DELIVERY (Continued)
FITTING, AIR METERING - #6714
O2S (OXYGEN SENSOR) REMOVER/INSTALLER -
FUEL FILTER/PRESSURE
REGULATOR

DESCRIPTION

The combination fuel filter and fuel pressure regu-
lator is located on the top of fuel pump module (Fig.
6).

OPERATION

A combination fuel filter and fuel pressure regula-
tor is used on all engines. A separate frame mounted
fuel filter is not used with any engine.
Fuel Pressure Regulator Operation: The pres-
sure regulator is a mechanical device that is not con-
trolled by engine vacuum or the Powertrain Control
Module (PCM).
The regulator is calibrated to maintain fuel system
operating pressure of approximately 339 ± 34 kPa
(49.2 ± 5 psi) at the fuel injectors. It contains a dia-
phragm, calibrated springs and a fuel return valve.
The internal fuel filter is also part of the assembly.
Fuel is supplied to the filter/regulator by the elec-
tric fuel pump through an opening tube at the bot-
tom of filter/regulator (Fig. 3).
The regulator acts as a check valve to maintain
some fuel pressure when the engine is not operating.
This will help to start the engine. A second check
valve is located at the outlet end of the electric fuel
pump.
If fuel pressure at the pressure regulator exceeds
approximately 49 psi, an internal diaphragm closes
and excess fuel pressure is routed back into the tank
#C-4907
through the pressure regulator. A separate fuel
return line is not used with any engine.

REMOVAL

The combination Fuel Filter/Fuel Pressure Regula-
tor is located on the fuel pump module. The fuel
pump module is located on top of fuel tank.
(1) Remove fuel tank. Refer to Fuel Tank Removal/

Installation.

(2) Clean area around filter/regulator.
(3) Disconnect fuel line at filter/regulator. Refer to
Quick-Connect Fittings in this group for procedures.
(4) Remove retainer clamp from top of filter/regu-
lator (Fig. 1) . Clamp snaps to tabs on pump module.
Discard old clamp.
(5) Pry filter/regulator from top of pump module
with 2 screwdrivers. Unit is snapped into module.
(6) Discard gasket below filter/regulator (Fig. 2) .
(7) Before discarding
inspect assembly to verify that o-rings (Fig. 3) are
intact. If the smallest of the two o-rings can not be
found on bottom of filter/regulator, it may be neces-
sary to remove it from the fuel inlet passage in fuel
pump module.
Fig. 1 Fuel Filter/Fuel Pressure Regulator
1 - RETAINER CLAMP
2 - FUEL FILTER/FUEL PRESSURE REGULATOR
3 - FUEL SUPPLY TUBE
4 - ALIGNMENT ARROW
INSTALLATION
The combination Fuel Filter/Fuel Pressure Regula-
tor is located on the fuel pump module. The fuel
pump module is located on top of fuel tank.
(1) Clean recessed area in pump module where fil-
ter/regulator is to be installed.
(2) Obtain new filter/regulator (two new o-rings
should already be installed) .
filter/regulator assembly,
TJ