Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Fuel Injection System - Diesel: Description
The General Motors 6.2L diesel engine uses a mechanical, high pressure rotary diesel 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.
An electric fuel pump delivers fuel to the injection pump. The fuel pump is mounted on the left side of frame and pulls fuel from the fuel tank through a primary filter. The fuel is then pumped through a secondary filter mounted on firewall (pickups) or rear of air cleaner (vans) to the injection pump.
High pressure fuel lines carry the fuel to an injection nozzle in each cylinder. All fuel lines are the same length to ensure no variance in timing. Engine RPM is controlled by a rotary fuel metering valve. As the accelerator pedal is depressed, throttle linkage opens fuel metering valve to allow increased fuel delivery.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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