GM Service Manual Online
For 1990-2009 cars only

    Important: 

       • Only use oil free compressed air to blow out the fuel pipes.
       • Inspect the fuel tank internally and clean the fuel tank if you find a plugged fuel filter.
       • 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 sender assembly.
  6. Inspect the fuel sender assembly inlet for dirt and debris. Replace the fuel sender assembly 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 in order to remove all of the water from the fuel tank.
  9. Install 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.
  12. Reconnect the negative battery cable.
  13. Use the following procedure in order to inspect for fuel leaks:
  14. 13.1. Turn on the ignition for 2 seconds, leaving the engine off .
    13.2. Turn off the ignition for 10 seconds.
    13.3. Turn on the ignition, leaving the engine off.
    13.4. Inspect for fuel leaks.