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The fuel pump is
The fuel pump is a high-pressure electric pump mounted in the fuel tank. The impeller serves as a vapor separator and precharges the high-pressure assembly. Fuel is pumped at a positive pressure through an in-line fuel filter to the fuel rail assembly. A pressure regulator maintains a preset pressure in the fuel line to the injectors. Excess fuel is returned to the fuel tank through the fuel return line. The electric fuel pump is connected in parallel to the PCM and is activated by the PCM when the ignition is turned on and the engine is cranking or operating. If the engine stalls or if the starter is not engaged, the fuel pumps will stop in about one second.
REMOVAL & INSTALLATION
3.0L Engine
Fig. The modular sender contains the pump, float, and reservoir
The electric fuel pump is a turbine pump located inside the modular fuel sender. The electric fuel pump operation is controlled by the PCM through the fuel pump relay.
Drain the fuel tank.
To install:
Install the fuel pump electrical connectors.
4.5L and 4.9L Engine
To install:
Fig. Sending unit installation-except 1993-98 Eldorado and Seville
Fig. Fuel sender assembly-except 1993-98 Eldorado and Seville
4.6L Engine
The fuel pump used in this system is part of the fuel sender assembly.
Special tools needed for the repair. J 34730-1A or equivalent, fuel pressure gauge. J 39765 Fuel sender lock nut wrench, or equivalent.
Drain the fuel tank to no more than
3
/
4
of a tank before removing the fuel sender retaining ring or fuel sender access panel in order to avoid possible fuel spillage.
Drain the fuel tank to at least
3
/
4
of a tank, if full.
To install:
Care should be taken not to fold over or twist the fuel pump strainer when installing the fuel sender assembly, as this will restrict fuel flow.
Turn the ignition switch
ON
for 2 seconds.
Turn the ignition switch
OFF
for 10 seconds.
Turn the ignition switch
ON
and check for leaks.
Fig. Diagram of a modular fuel sender depicting the typical fuel flow
TESTING
3.0L Engine
The special tool required to perform these tests is J 34730-91 Fuel Pressure gauge or equivalent.
Except 3.0L Engine
When the ignition switch is turned
ON
, the PCM will turn
ON
the in-tank fuel pump. The fuel pump is located inside the modular fuel sender. The fuel pump is not serviceable separate from the sender. The in-tank fuel pump will remain
ON
as long as long as the t engine is cranking or running and the PCM is receiving reference pulses. If there are no reference pulses. The PCM will turn the in-tank fuel pump
OFF
2 seconds after the ignition switch is turned
ON
or 2 seconds after the engine stops running.
Fig. Diagram of a typical fuel system pressure test
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