GM Service Manual Online
For 1990-2009 cars only

Cleaning Procedure

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.

Important: Whenever the fuel tank is cleaned, the fuel pump fuel strainer must be inspected. If the fuel pump fuel strainer is contaminated, the fuel pump fuel strainer must be replaced and the fuel pump must be inspected.

Important: Always maintain cleanliness when servicing the fuel system components.

  1. Remove the fuel tank. Refer to Fuel Tank Replacement .
  2. Remove the fuel sender assembly. Refer to Fuel Sender Assembly Replacement .
  3. Inspect the fuel pump strainer inlet for dirt and for debris. If dirt and debris are found, the fuel pump strainer needs to be replaced.
  4. Flush the fuel tank with hot water.
  5. Pour the water out of the fuel sender assembly opening in the fuel tank. Rock the fuel tank in order to ensure that the removal of the water from the fuel tank is complete.
  6. Allow the tank to dry completely before reassembly.
  7. Install the fuel sender assembly. Refer to Fuel Sender Assembly Replacement .
  8. Replace the fuel tank. Refer to Fuel Tank Replacement .
  9. Replace the fuel filter. Refer to Fuel Filter Replacement .