Fuel System

Fuel System - 4.6L, 5.4L and 6.8L

The fuel system consists of the following components:

- Fuel and vapor tubes
- Fuel Pump (FP) module (located in the fuel tank)
- Fuel tank filler pipe assembly
- Fuel tank
- Fuel rail (located on the engine)
- Fuel injectors (located on the fuel rail)

The vehicle is equipped with a Multi-Port Fuel Injection (MFI) system. The fuel injectors are separately controlled and are mounted to the intake manifold. The fuel injectors are supplied with pressurized fuel from the FP module through the fuel rail. The 2 speed Mechanical Returnless Fuel System (MRFS) controls the FP module through the PCM. The fuel rail has a fuel pressure sensor which controls the pressure going to the fuel injectors. The fuel system is a 2-speed MRFS. The fuel system has a FP control module, which varies voltage to the FP based on fuel system demand.


Fuel Pump (FP) Shut-off Feature

In the event of a moderate to severe collision, the vehicle is equipped with a Fuel Pump (FP) shut-off feature that is initiated by the event notification signal.

The event notification signal is a signal provided by the Restraints Control Module (RCM) to the FP control module. Signal communication between the RCM and the FP control module allows the PCM to shut-off the FP.

Should the vehicle shut off after a collision due to this feature, the vehicle may be restarted by first turning the ignition switch to the OFF position and then turn the ignition switch to the ON position. In some instances the vehicle may not start the first time and may take one additional key cycle.

For exploded view information of the fuel system, refer to Fuel Tank and Filler Pipe - Exploded View or Fuel Line - 4.6L, 5.4L and 6.8L in Fuel Delivery and Air Induction.