Fuel Delivery System

FUEL SYSTEM COMPONENTS
The fuel control system consists of the following components:

- Central multiport fuel injection assembly referred to as Central Multiport Fuel Injection (MFI).
- Fuel pump.
- Fuel pump relay.
- Fuel tank.
- Accelerator control components.
- Fuel lines.
- Fuel filter.
- Evaporative Emission (EVAP) control system.

DESCRIPTION
The fuel control system has an electric fuel pump, located in the fuel tank on the gage sending unit. It pumps fuel to the Central MFI unit through an in-line fuel filter and fuel supply line. The pump provides fuel at a pressure above the regulated pressure needed by Central MFI injector.

A pressure regulator in the Central MFI unit keeps fuel available to the injector at a constant pressure. Fuel in excess of injector needs is returned to the fuel tank by a separate line.

The control module controls the injector that is located in the Central Multiport Fuel Injection (Central MFI) assembly. The Central MFI delivers fuel in response to the pulse width mandated signal from the control module in one of several modes, described above.

In order to properly control the fuel supply, the fuel pump is operated by the control module through the fuel pump relay and oil pressure switch. Refer to CHART A-5. Under Computers and Control Systems/Service and Repair. Testing and Inspection

BASIC SYSTEM OPERATION
The fuel supply is stored in the fuel tank. An electric fuel pump, located in the fuel tank with the gage sending unit, pumps fuel through an inline fuel filter to the Central MFI unit. The pump is designed to provide fuel at a pressure greater than is needed by the injectors.

The pressure regulator, part of the Central MFI assembly, keeps fuel available to the injectors at a regulated pressure Unused fuel is returned to the fuel tank by a separate line. See specific component for repair and replacement procedures covering the fuel tank, fuel pump, in-line filter and fuel lines.