Fuel System: Notes

The fuel system consists of:

• a Multi-Port Fuel Injection (MFI) system.
• a 2-speed Mechanical Returnless Fuel System (MRFS).
• Easy Fuel^TM (capless) fuel tank filler pipe assembly.
• a fuel tank filler pipe containing:
  • a recirculation tube.
  • a fresh air hose.
  • a restrictor plate to permit only unleaded fuel to be pumped into the tank.
• a fuel tank.
• a Fuel Pump (FP) module containing:
  • an electric FP  , which provides pressurized fuel to the fuel rail.
  • a lifetime fuel filter serviced as part of the FP  module.
  • a serviceable fuel level sender.
  • a check valve, which maintains system pressure after the FP  is shut off.
  • a pressure relief valve for overpressure protection in the event of restricted fuel flow.
• fuel, vapor and brake tubes in an integrated bundle assembly attached to the underside of the vehicle by retaining clips.
• a fuel rail.
• fuel injectors.
• fuel pump control module.

The fuel tank filler pipe cannot be modified in any way.

The vehicle is equipped with electronic Multi-Port Fuel Injection (MFI) that is supplied by a 2-speed Mechanical Returnless Fuel System (MRFS). The PCM is able to maintain constant fuel pressure by varying the FP  output. This is accomplished by increasing or decreasing voltage supplied by the fuel pump control module to the FP  based on the duty cycle request from the PCM. The returnless fuel system offers improved economy, lower fuel temperatures and decreased fuel vapor in the fuel tank.