Fuel Injection System - V6 & V8 Diesel: Description

Diesel mechanical fuel injection systems differ greatly from electronic fuel injection systems. In this diesel system, a mechanical high pressure rotary pump, gear driven by the camshaft at camshaft speed, injects a precisely metered amount of fuel to each cylinder at the proper time. The pump is mounted on top of the engine and provides necessary timing advance under all operating conditions.

High pressure fuel pipes (6 or 8) carry fuel from pump to an injection nozzle in each cylinder. All pipes are exactly the same length to insure that there is no variance in timing. Engine RPM is controlled by a rotary fuel metering valve. As accelerator pedal is pushed down, throttle cable opens metering valve to allow increased fuel delivery. A built-in low pressure transfer pump delivers fuel to main injection pump.

A fuel filter is located between the electric (V6) or mechanical (V8) fuel supply pump (mounted on side of engine block) and the fuel injection pump. Any excess fuel is returned to tank by a fuel return system.