Fuel Pump: Description and Operation

Fuel Supply System:

The fuel pump is a roller vane, high pressure electric pump, mounted in the fuel tank. Fuel is pumped at a positive pressure from the fuel pump through the in-line filter to the pressure regulator in the Central Multiport Fuel Injection (MFI) unit. Excess fuel is returned to the fuel tank through the fuel return line.

The fuel pump is attached to the fuel gage sender assembly. A fuel strainer is attached to the fuel pump inlet line and prevents dirt particles from entering the fuel line and tends to separate water from the fuel.

Vapor lock problems are reduced when using an electric pump because the fuel is pushed from the tank under pressure rather than being pulled under vacuum, a condition that produces vapor.

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/System Diagnosis/Procedures/Diagnostic Charts. Testing and Inspection

COMPONENTS
The fuel supply system consists of the following components:

- Fuel pump.
- Fuel tank.
- Accelerator control components.
- Fuel lines.
- Fuel filter.