FUEL PRESSURE REGULATOR
DESCRIPTION
A combination fuel filter and fuel pressure regula-
tor is used on all gas powered engines. It is located
on the top of the fuel pump module.
It contains a diaphragm, calibrated springs and a
fuel return valve. The internal fuel filter (Fig. 8) is
also part of the assembly.
OPERATION
Fuel Pressure Regulator Operation: The pres-
sure regulator is a mechanical device that is cali-
brated to maintain fuel system operating pressure of
approximately 400 kPa (58 psi) at the fuel injectors.
Fuel is supplied to the filter/regulator by the elec-
tric fuel pump through an opening tube at the bot-
tom of filter/regulator.
The fuel pump module contains a check valve to
maintain some fuel pressure when the engine is not
operating. This will help to start the engine (Fig. 9).
If fuel pressure at the pressure regulator exceeds
approximately 58 psi, an internal diaphragm closes
and excess fuel pressure is routed back into the tank
through the pressure regulator. A separate fuel
return line is not used with any gas powered engine.
REMOVAL
(1) Release fuel pressure, Refer to Fuel System
Pressure Release Procedure in the Fuel Delivery sec-
tion.
(2) Remove Fuel Tank refer to the Fuel Tank
Removal/Installation in this group.
(3) Lower fuel tank and remove the purge line and
vent line.
(4) Disconnect fuel line from pressure regulator.
(5) Push locking tab in from locking slot. Turn
pressure regulator to unlock it (Fig. 10).
(6) Pull regulator straight up.
INSTALLATION
(1) Push regulator down and into place.
(2) Turn fuel pressure regulator to lock it in place
(Fig. 10). Make sure take the locking tab is in the
locking slot.
(3) Connect fuel line to regulator
(4) Raise the fuel tank on the transmission stand.
Fig. 8 Side View - Filter/Regulator
1 - INTERNAL FUEL FILTER
2 - FUEL FLOW TO FUEL INJECTORS
3 - FUEL FILTER/FUEL PRESSURE REGULATOR
4 - O-RINGS
5 - EXCESS FUEL BACK TO TANK
6 - FUEL INLET
7 - CALIBRATED SPRINGS
8 - RUBBER GROMMET AT PUMP MODULE
9 - LOCKING TAB
Fig. 9 Side View - Filter/Regulator
1 - INTERNAL FUEL FILTER
2 - FUEL FLOW TO FUEL INJECTORS
3 - FUEL FILTER/FUEL PRESSURE REGULATOR
4 - O-RINGS
5 - EXCESS FUEL BACK TO TANK
6 - FUEL INLET
7 - CALIBRATED SPRINGS
8 - RUBBER GROMMET AT PUMP MODULE
9 - LOCKING TAB
LH FUEL DELIVERY 14 - 7
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