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.
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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 5 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 6.6L (LMM) - INTRODUCTION (2 OF 2))REPAIR INSTRUCTIONSFUEL SYSTEM CLEANINGCLEANING GASOLINE FROM THE FUEL SYSTEM
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Cleaning Gasoline from the Fuel System
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Cleaning Gasoline from the Fuel System
WARNING: This page is about a different variant/trim than selected.
- Drain the fuel tank.
- Fill the fuel tank to 1/4 full.
- Disconnect the CKP sensor. Refer to Crankshaft Position Sensor Replacement .
- Install a hose on the fuel return line near the glow plug relay, and insert the other end into a 7.6 liters (2 gallon) metal container.
- Turn the ignition ON with the engine OFF. Allow the fuel pump to run until the cycle ends or until 3.8 liters (1 gallon) of fuel has passed into the container.
- Reconnect the fuel return line.
- Clean any fuel spillage from the engine.
- Reconnect the CKP sensor.
- Attempt to start and run the engine for 15 minutes. If the engine does not start, cycle the ignition and allow the fuel pump to run until the cycle ends.
- Start the engine.
- Stop the engine.
- Check for fuel leaks.
- Clear the engine of any diagnostic trouble codes (DTCs).
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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.