GM Service Manual Online
For 1990-2009 cars only

Cleaning Procedure

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.

Notice: Cap the fittings and plug the holes when servicing the fuel system in order to prevent dirt and other contaminants from entering the open pipes and passages.

Important: When flushing the fuel tank, treat the fuel and water mixture as a hazardous material. Handle the material in accordance with all local, state and federal laws and regulations.

Important: Whenever the fuel tank is cleaned, inspect the fuel pump fuel strainer. If the fuel pump fuel strainer is contaminated, replace the fuel pump fuel strainer and inspect the fuel pump.

Important: Always maintain cleanliness when servicing fuel system components.

  1. Remove the fuel tank. Refer to Fuel Tank Replacement .
  2. Inspect the fuel pump inlet for dirt and debris. If dirt and debris are found, replace the fuel pump.
  3. Flush fuel tank with hot water.
  4. 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.
  5. Allow tank to dry completely before reassembly.
  6. Install the fuel sender assembly. Refer to Fuel Sender Assembly Replacement .
  7. Install the fuel tank. Refer to Fuel Tank Replacement .