Engine management system - EDC (Fuel system): Description and operation

FUEL SYSTEM

Fuel injection pump (electronic)

1. Fuel quantity servo potentiometer
2. Fuel quantity servo control unit
3. Fuel shut off solenoid
4. Injection timing device solenoid valve

The fuel injection pump is a vane-type pump, which is belt driven from the rear end of the camshaft. Fuel delivery from the pump to the injectors is regulated by the movement of a control spool. Movement of the control spool increases or decreases the fuel delivery rate to meet engine operating requirements.

The pump houses the following components which either provide feed back to the engine control module or are controlled by the engine control module:

5. Control spool
6. Injection timing device
7. Injection pump drive shaft
8. Fuel temperature sensor