Fuel Injection Pump

Diesel fuel is drawn from the tank by the injection pump's integral feed pump. Fuel supplied to injection pump is sent into the plunger by the control sleeve in an amount proportional to accelerator pedal position. Control sleeve is linked to the accelerator pedal. The plunger directs high pressure fuel through the delivery valve, into the fuel lines, then to the injectors.

Injection pump fuel pressure is proportional to engine speed. A pressure regulating valve is built into the pump. Any fuel leaking at sliding section of the injector needle valve at time of injection is returned to the housing through the return line. Fuel circulates through the housing to cool and lubricate the pump. Surplus fuel is returned to the tank through the return line.

A fuel cut-off solenoid, located on the pump, is activated with the ignition switch in the "RUN" or "START" position. It interrupts fuel flow on the distributor side of the injection pump when the ignition switch is turned off. This closes the intake port of the plunger and stops the engine.