GM Service Manual Online
For 1990-2009 cars only

Important: 

  1. Only use oil free compressed air to blow out the fuel pipes.
  2. Inspect the fuel tank internally and clean the fuel tank if you find a plugged fuel filter.

Important: Important when flushing the fuel tank, the fuel and water mixture needs to be treated as a hazardous material. The material needs to be handled in accordance with all local, state and federal laws and regulations.

  1. Relieve the fuel system pressure. Refer to the Fuel Pressure Relief .
  2. Drain the fuel tank. Refer to Fuel Tank Draining .
  3. Remove the fuel tank. Refer to Fuel Tank Replacement .
  4. Remove the fuel sender assembly. Refer to Fuel Sender Assembly Replacement .
  5. Inspect the fuel pump strainer. Replace a contaminated strainer and inspect the fuel pump.
  6. Inspect the fuel pump inlet for dirt and debris. Replace the fuel pump if you find dirt or debris in the fuel pump inlet.
  7. Flush the fuel tank with hot water.
  8. Pour the water out of the fuel sender assembly opening. Rock the tank to be sure that removal of the water from the tank is complete.
  9. Reinstall the fuel sender assembly. Refer to Fuel Sender Assembly Replacement .
  10. Install the fuel tank. Refer to Fuel Tank Replacement .
  11. Refill the fuel tank and reinstall the fuel filler cap.
  12. Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  13. Reconnect the negative battery cable.
  14. Inspect for fuel leaks.
  15. 13.1. Turn the ignition switch ON for 2 seconds.
    13.2. Turn the ignition switch OFF for 10 seconds.
    13.3. Turn the ignition switch ON.
    13.4. Check for fuel leaks.