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Home >> Chevrolet >> 2004 >> Avalanche 2500 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 8.1L (Introduction) >> Repair Instructions >> Fuel System Cleaning
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Fuel System Cleaning

  1. Remove the sending unit. Refer to Fuel Sender Assembly Replacement (Front Tank)  or Fuel Sender Assembly Replacement (Rear Tank) .
  2. Inspect the fuel pump strainer. Replace the sending unit if the strainer is contaminated.
  3. Inspect the fuel pump inlet for dirt and debris. Replace the sending unit if dirt or debris is found in the fuel pump inlet.
    4. IMPORTANT: When flushing the fuel tank, handle the fuel and water mixture as a hazardous material. Handle the fuel and water mixture in accordance with all applicable local, state, and federal laws and regulations.
  4. Flush the fuel tank with hot water.
  5. Pour the water out of the sending unit opening. Rock the tank to be sure that removal of the water from the tank is complete.
  6. Install the sending unit. Refer to Fuel Sender Assembly Replacement (Front Tank)  or Fuel Sender Assembly Replacement (Rear Tank) .
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