Fuel Injection Pump (Fuel delivery system)

Fuel Injection Pump

The fuel injection pump is a vane type pump, which is located on the front of the engine and driven by a belt from a pulley on the camshaft. The fuel injection pump draws fuel from the tank through a rubber pipe and the fuel filter. From the fuel filter, the fuel is drawn through a fuel cooler, located behind the bonnet locking platform, to the pump. The fuel injection pump delivers a precisely timed and metered quantity of fuel to each injector. The rubber fuel feed and return pipes connect to metal pipes which are routed around the engine.

Any excess (leak-off) fuel delivered to the pump and injectors is returned to the fuel tank through a rubber return pipe. The returned fuel is delivered to the tank through a port in the fuel pick-up and delivered to the swirl pot.

Fuel Filter

The fuel filter is located in the engine compartment on the left hand side of the bulkhead. Two connections on the top face allow for the fitment of the hoses from the the fuel tank and to the fuel injection pump.

A screw located on the bottom surface allows for drainage of the filter to remove moisture and particle contamination. The feed hose from the filter incorporates a bulb type handpump. The handpump is used, in conjunction with a filter bleed screw on the top face of the filter, to prime the filter and the fuel line after servicing.

Injectors

Three injectors and an injector incorporating a needle lift sensor are fitted to the cylinder head. Each injector supplies fuel to one cylinder and is retained in its port in the cylinder head with a clamp and bolt arrangement.

The injectors receive fuel at pressure from the fuel injection pump. Each injector has a nozzle with five spray orifices. The orifices protrude into the combustion chamber and spray fuel into the chamber, atomizing the fuel and mixing it with the air prior to combustion.