Toyota
Dodge Durango
 Service Manual
Fuel System » Fuel delivery system » Description and operation
Fuel filter/fuel pressure regulator

DESCRIPTION

A combination fuel filter and fuel pressure regulator (Fig. 3) is used on all engines. It is located on the top of the fuel pump module. A separate frame mounted fuel filter is not used with any engine.

Both fuel filters (at bottom of fuel pump module and within fuel pressure regulator) are designed for extended service. They do not require normal scheduled maintenance. Filters should only be replaced if a diagnostic procedure indicates to do so.

OPERATION

Fuel Pressure Regulator Operation: The pressure regulator is a mechanical device that is not controlled by engine vacuum or the powertrain control module (PCM).

The regulator is calibrated to maintain fuel system operating pressure of approximately 339 kPa + - 34 kPa (49.2 psi + -5 psi) at the fuel injectors. It contains a diaphragm, calibrated springs and a fuel return valve. The internal fuel filter (Fig. 3) is also part of the assembly.

Fig. 3 Side View-Filter/Regulator Fig. 3 Side View-Filter/Regulator

1 - INTERNAL FUEL FILTER

2 - FUEL FLOW TO FUEL INJECTORS

3 - FUEL FILTER/FUEL PRESSURE REGULATOR

4 - EXCESS FUEL BACK TO TANK

5 - FUEL INLET

6 - RUBBER GROMMET

7 - TOP OF PUMP MODULE

Fuel is supplied to the filter/regulator by the electric fuel pump through an opening tube at the bottom 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. Refer to Fuel Pump-Description and Operation for more information. Also refer to the Fuel Pressure Leak Down Test and the Fuel Pump Pressure Tests.

If fuel pressure at the pressure regulator exceeds approximately 49.2 psi, an internal diaphragm opens and excess fuel pressure is routed back into the tank through the bottom of pressure regulator.

Both fuel filters (at bottom of fuel pump module and within fuel pressure regulator) are designed for extended service. They do not require normal scheduled maintenance. Filters should only be replaced if a diagnostic procedure indicates to do so.

    More about «Description and operation»:

    Pcm vin reprogramming

    Fuel delivery system

    Fuel pump module

    Fuel pump

    Fuel gauge sending unit

    Fuel filter/fuel pressure regulator

    Fuel tank

    Fuel injectors

    Fuel rail-3.9/5.2/5.9L engines

    Fuel injector rail-4.7L engine

    Fuel tank filler tube cap

    Fuel tubes/lines/hoses and clamps

    Quick-connect fittings

    Dodge Durango Service Manual / Fuel System / Fuel delivery system / Description and operation / Fuel filter/fuel pressure regulator

    Dodge Durango Service Manual

    Categories


    © 2017-2019 Copyright www.dodurango.net
    0.0047