Fuel System: Operation

Fuel is picked up in the fuel tank by the fuel pump module. This module is located on the bottom of the fuel tank.

A fuel return system is provided within the fuel pump module using check valves. A separate fuel return line from the engine to the tank is not used.

The fuel pressure regulator and the main fuel filter are not combined. They are separate items.

The fuel tank assembly consists of: the fuel tank, fuel pump module assembly, fuel pump module lock ring/gasket, ORVR components.

A fuel filler/vent tube assembly using a pressure/vacuum, 1/4 turn fuel filler cap is used. The fuel filler tube contains a flap door located below the fuel fill cap. A one-way check valve is installed into the tanks fuel fill fitting.

Also to be considered part of the fuel system is the evaporation control system and ORVR system. This is designed to reduce the emission of fuel vapors into the atmosphere.

Both fuel filters (mounted to front of fuel tank, and inside the bottom fuel pump module) are designed for extended service. They do not require normal scheduled maintenance. The bottom section of the fuel pump module (with included filter) should only be replaced if a diagnostic procedure indicates to do so. Also, the fuel filter mounted to the front of the fuel tank should only be replaced if a diagnostic procedure indicates to do so.