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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1876 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 4.3L - INTRODUCTION)REPAIR INSTRUCTIONSFUEL SYSTEM CLEANING
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6

Fuel System Cleaning

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Fuel System Cleaning
WARNING: This page is about a different car, the 2009 GMC Savana and 2009 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
    WARNING: Refer to Battery Disconnect Warning .
  1. Disconnect the negative battery cable.
  2. Relieve fuel system pressure. Refer to Fuel Pressure Relief (With CH-48027)  or Fuel Pressure Relief (Without CH-48027) .
  3. Drain fuel tank. Refer to Fuel Tank Draining (with L59)  or Fuel Tank Draining (without L59) .
  4. Remove the fuel tank. Refer to Fuel Tank Replacement (with E26)  or Fuel Tank Replacement (without E26) .
  5. Remove the fuel tank fuel pump module. Refer to Fuel Tank Fuel Pump Module Replacement .
  6. Inspect the fuel strainer. Replace a contaminated strainer and inspect the fuel pump.
  7. Inspect the fuel pump inlet for dirt and debris. Replace the fuel pump if you find dirt or debris in the fuel pump inlet.
    8. NOTE: When flushing the fuel tank, handle the fuel and water mixture as a hazardous material. Handle the fuel and water mixture in accordance with all applicable local, state and federal laws and regulations.
  8. Flush the fuel tank with hot water.
  9. Pour the water out of the fuel sender assembly opening.
  10. Rock the tank to ensure that removal of the water from the tank is complete.
  11. Inspect the fuel filter for contamination.
  12. Replace the fuel filter if the filter is plugged.
    13. NOTE: Only use oil-free compressed air to blow out the fuel pipes.
  13. Clean the fuel lines by applying air pressure in the opposite direction of the fuel flow.
  14. Install the fuel tank fuel pump module with a new seal into the fuel tank. Refer to Fuel Tank Fuel Pump Module Replacement .
  15. Install the fuel tank. Refer to Fuel Tank Replacement (with E26)  or Fuel Tank Replacement (without E26) .
  16. Inspect for leaks:
    1. Turn ON the ignition for 2 seconds.
    2. Turn OFF the ignition for 10 seconds.
    3. Turn ON the ignition .
    4. Inspect for fuel leaks.
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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.