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 - 6.2L Diesel: Description
General Motors 6.2L 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.
A mechanical fuel pump which is mounted on right of engine pulls fuel from fuel tank through a primary filter. Fuel then is pumped through a secondary filter mounted on intake manifold and then to the injection pump. High pressure fuel lines carry fuel from pump to an injection nozzle in each cylinder. All fuel lines 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 linkage opens 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.