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Home >> Chevrolet >> 2004 >> Monte Carlo LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System 3.4L (Introduction) >> Repair Instructions >> Fuel System Cleaning >> Cleaning Procedure
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Cleaning Procedure

NOTE: Refer to Cover and Plug Openings Notice in Cautions and Notices.
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: When ever 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 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 inlet for dirt and debris. If dirt and debris are found, the fuel pump needs to be replaced.
  4. Flush 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 be sure that the removal of the water from the fuel tank is complete.
  6. Allow the fuel tank to dry completely before reassembly.
  7. Install the fuel sender assembly. Refer to Fuel Sender Assembly Replacement .
  8. Install the fuel tank. Refer to Fuel Tank Replacement .
  9. Replace the fuel filter. Refer to Fuel Filter Replacement .
  10. Add fuel and install the fuel tank filler pipe cap.
  11. Reconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
  12. 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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