General System Description

Fig 1 Top View Of Fuel Pump Module:

Fig 2 Fuel Pump Module Components -- Typical:

The fuel delivery system consists of:
- the fuel pump module containing the electric fuel pump. fuel filter/fuel pressure regulation, rollover valves and fuel gauge sending unit (fuel level sensor)
- fuel pump inlet filter (at bottom of pump module)
- fuel tubes/lines/hoses
- quick-connect fittings
- fuel injector rail
- fuel injectors
- fuel tank
- fuel tank filler tube cap
- accelerator pedal
- throttle cable

Fuel is returned through the fuel pump module and back into the fuel tank through the fuel filter/ fuel pressure regulator.
- A separate fuel return line from the engine to the tank is not used with any gasoline powered engine.

The fuel tank assembly consists of: the fuel tank, fuel filler tubes, fuel gauge sending unit/electric fuel pump module, and a pressure-vacuum filler cap.

A fuel filler/vent tube assembly using a pressure vacuum fuel filler cap is used. The fuel filler tube contains a spring-loaded flap (door) located below the fuel fill cap. The flap is used as a secondary way of sealing the fuel tank if the fuel fill cap has not been properly tightened. It is part of the EVAP monitor system when the vehicle is equipped with a Leak Detection Pump (LDP).

Note: This flap is also installed to the fuel filler/vent tube assembly on vehicles without an LDP.

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

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.