Fuel Delivery: Notes

All models use an electric, fuel-lift pump mounted on the left frame rail. Pump pulls fuel from the fuel tank through a primary filter. The fuel is then pumped through a secondary filter, mounted on firewall or rear of intake manifold, and to the fuel injection pump.

The diesel engine uses a mechanical, high-pressure, rotary fuel injection pump, which is gear-driven by camshaft at camshaft speed. Pump injects a precisely metered amount of fuel to each cylinder at the proper time based on inputs from the PCM.

High-pressure fuel lines carry fuel to an injection nozzle in each cylinder. All fuel lines are the same length to ensure no variance in timing. An electric fuel solenoid controls engine RPM. As the Accelerator Pedal Position (APP) sensor is pressed down, PCM operates fuel solenoid through fuel solenoid driver to allow increased fuel delivery.