Fuel System - General Information

FUEL SYSTEM

WARNING: Do not smoke or carry lighted tobacco or open flame of any type when working on or near any fuel-related component. Highly flammable mixtures are always present and may be ignited, resulting in possible personal injury.

The fuel system consists of:
- a fuel rail.
- a multiport fuel injection (MFI) system.
- a standard fuel tank.
- fuel tubes.
- a fuel filter providing filtration to protect the fuel injectors from foreign material.
- a 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.
- a 1/4 turn-type fuel tank filler cap.
- an inertia fuel shutoff (IFS) switch.
- a bottom mount fuel pump module (FPM) containing:
- the electric fuel pump 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 air flow.

The fuel pump is controlled by powertrain control module (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 multiport fuel injection. The PCM is able to maintain constant fuel pressure by varying FPM output. This is accomplished by increasing or decreasing voltage supplied to the tank-mounted FPM.