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14 - 6
FUEL DELIVERY
FUEL LEVEL SENDING UNIT / SENSOR (Continued)
Fig. 6 LEVEL SENSOR
Fig. 7 LEVEL SENSOR ARM
(7) Install fuel pump module. Refer to Fuel Pump
Module in this section.
FUEL PRESSURE REGULATOR
OPERATION
Fuel Pressure Regulator Operation: The pres-
sure regulator (Fig. 8) is a mechanical device that is
calibrated to maintain fuel system operating pressure
of approximately 400 kPa ±34 kPa (58 psi ±5 psi.) at
the fuel injectors.
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.
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.
Fig. 8 PRESSURE REGULATOR
REMOVAL
The fuel pressure regulator is part of the fuel
pump module. Remove the fuel pump module from
the fuel tank to access the fuel pressure regulator.
Refer to the Fuel Pump Module removal in this sec-
tion.
(1) Spread tangs on pressure regulator retainer.
(2) Pry fuel pressure regulator out of housing.
(3) Ensure both upper and lower O-rings were
removed with regulator.
INSTALLATION
The fuel pressure regulator is part of the fuel
pump module. Remove the fuel pump module from
the fuel tank to access the fuel pressure regulator.
Refer to the Fuel Pump Module removal in this sec-
tion.
(1) Lightly lubricate the O-rings with clean engine
oil and place them into opening in pump module.
(2) Push regulator into opening in pump module.
(3) Tabs hold regulator in housing.
FUEL PUMP
DESCRIPTION
The electric fuel pump is located in and is part of
the fuel pump module. It is a positive displacement,
gerotor type, immersible pump with a permanent
JR
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