Fuel Injection System - Diesel: Description

The General Motors 6.2L diesel engine uses a mechanical high pressure rotary pump, gear driven by camshaft at camshaft speed. It injects a precisely metered amount of fuel to each cylinder at the proper time.

An electrical fuel pump, mounted on left side of frame, pulls fuel from fuel tank through a primary filter. Fuel is pumped through a secondary filter mounted on firewall (pickups) or rear of air cleaner (vans) to the injection pump. High pressure fuel lines carry fuel from pump to an injection nozzle in each cylinder. All fuel lines are the same length to ensure that there is no variance in timing. Engine RPM is controlled by a rotary fuel metering valve. As accelerator pedal is pushed down, throttle linkage opens metering valve to allow increased fuel delivery.