Gasoline Fuel Systems: Overview

Overview

The fuel system supplies the Sequential Multiport Fuel Injection (SFI) fuel injectors with clean fuel at controlled pressure. The powertrain control module (PCM) controls the fuel pump and monitors the fuel pump circuit. The PCM also controls the duration of the on/off cycle providing correct timing of the fuel injectors. If the injectors have been replaced, it is necessary to clear learned values contained in the Keep Alive Random Access Memory (RAM) in the PCM. This can be done by disconnecting the battery or the PCM for five minutes. (Refer to Section 2, Powertrain Control Module (PCM) Reset, for more information.

Three types of fuel systems used are:

- Returnable Fuel
- Mechanical Returnless Fuel
- Electronic Returnless Fuel