Fuel Systems: Overview

The fuel system supplies the sequential multi-port fuel injection (SFI) fuel injectors with clean fuel at a controlled pressure. The powertrain control module (PCM) controls the fuel pump and monitors the fuel pump circuit. The PCM controls the fuel injector on/off cycle duration and determines the correct timing and amount of fuel delivered. If the injectors have been replaced it is necessary to reset the learned values contained in the keep alive memory (KAM) in the PCM. Refer to RESETTING THE KEEP ALIVE MEMORY (KAM) .

The 3 types of fuel systems used are:

• Returnable Fuel
• Mechanical Returnless Fuel
• Electronic Returnless Fuel