2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6FACTORY OEM SERVICE PROCEDURE

Cleaning Gasoline from the Fuel System

  1. Drain the fuel tank.
  2. Fill the fuel tank to 1/4 full.
  3. Disconnect the CKP sensor. Refer to Crankshaft Position Sensor Replacement .
  4. 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.
  5. 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.
  6. Reconnect the fuel return line.
  7. Clean any fuel spillage from the engine.
  8. Reconnect the CKP sensor.
  9. 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.
  10. Start the engine.
  11. Stop the engine.
  12. Check for fuel leaks.
  13. Clear the engine of any diagnostic trouble codes (DTCs).
Factory Service Tools

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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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