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Home >> Chevrolet >> 2007 >> Chevy Express G2500, Van Cargo, 6.6 6 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Engine Control System & Fuel System - 6.6L (LLY) - Introduction (2 Of 2)) >> Repair Instructions >> Fuel System Cleaning >> Cleaning Gasoline from the Fuel System

Cleaning Gasoline from the Fuel System

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  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).
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