Fuel System - General Information

FUEL SYSTEM

WARNING:
- Do not smoke, carry lighted tobacco or have an open flame of any type when working on or near any fuel-related component. Highly flammable mixtures are always present and may be ignited. Failure to follow these instructions may result in serious personal injury.
- Do not carry personal electronic devices such as cell phones, pagers or audio equipment of any type when working on or near any fuel-related component. Highly flammable mixtures are always present and may be ignited. Failure to follow these instructions may result in serious personal injury.

The fuel system consists of the:
- fuel rail.
- multi-port fuel injection (MFI) system.
- standard fuel tank.
- fuel tubes.
- fuel filter providing filtration to protect the fuel injectors from foreign material.
- fuel tank filler pipe assembly, which cannot be modified in any way, that also contains a restrictor plate to permit only unleaded fuel to be pumped into the tank.
- fuel tank level shutoff valve that prevents spitback during refueling.
- 1/4 turn-type fuel tank filler cap.
- inertia fuel shutoff (IFS) switch.
- fuel pump (FP) module containing:
- the electric FP module which provides pressurized fuel to the engine.
- the fuel level sensor.
- an inlet filter.
- a check valve which maintains system pressure after the pump is shut off.
- a pressure relief for overpressure protection in the event of restricted fuel flow.

The FP module is controlled by the PCM. Electrical power to the pump is provided through the IFS switch located under the right front kick panel.

The engines are equipped with sequential multi-port fuel injection. The PCM is able to maintain constant fuel pressure by varying FP module output. This is accomplished by increasing or decreasing voltage supplied to the tank-mounted FP module.