Fuel Systems: Overview

The fuel system supplies the sequential multiport 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. When a new fuel injector is installed it is necessary to reset the learned values contained in the keep alive memory (KAM) in the PCM. Refer toRESETTING THE KEEP ALIVE MEMORY (KAM) .

The 2 types of fuel systems used are:

• electronic returnless fuel
• mechanical returnless fuel