Fuel Injection System - Diesel: Description
The diesel fuel injection pump is an opposed plunger, inlet metered, positive displacement, distributor pump. The pump incorporates a single pumping chamber, an integral fuel transfer pump and governor, and an automatic injection advance mechanism. On-off control is provided by an electric solenoid located in the injection pump housing cover.
Fuel from the tank is routed to fuel supply pump which pumps fuel through a combination fuel filter, heater, and water separator. Fuel enters the inlet of the injection pump and is delivered under high pressure through the injectors into the cylinders for combustion. Each injector is equipped with a fuel return fitting and excess fuel from the injectors and injection pump are collected in bleed-off lines and returned to fuel tank.
A vacuum switch located in fuel filter head will activate a light on instrument panel when filter needs replacement. A probe in the water separator portion of fuel filter assembly will activate a warning light on instrument panel when filter/water separator requires draining at the water and sediment drain, located at bottom of assembly.