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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 977 (Engine Controls - 6.6L (LLY) (Introduction)) >> Repair Instructions >> Fuel System Cleaning >> Cleaning Water from the Fuel System

Cleaning Water from the Fuel System

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the negative battery. Refer to Battery Negative Cable Disconnect/Connect Procedure (Single Battery) or Battery Negative Cable Disconnect/Connect Procedure (Auxiliary Battery) in Engine Electrical.
  2. Remove the sending unit. Refer to Fuel Sender Assembly Replacement .
  3. Inspect the fuel tank and the fuel sender for rust, fungi or bacteria. If there is rust, replace the rusted components.
  4. Clean the inside of the fuel tank and the fuel sender with hot water.
  5. Use compressed air in order to dry the fuel tank and the fuel sender.
  6. Disconnect the ends of the following lines:
    • The fuel filter inlet line (both ends)
    • The transfer pump pressure line and suction line (if applicable)
    • The fuel filter outlet line (both ends)
    • The fuel filter drain
    • The fuel return line (both ends)
  7. Inspect each of the pipes and lines.
  8. Replace any rusted pipes.
  9. Clean the inside of the fuel filter housing.
  10. Dry the fuel filter housing with compressed air.
  11. Dry the inside of each line with low pressure air.
  12. Remove the ignition 1 relay from the underhood relay center.
  13. Install a new fuel filter. Refer to Fuel Filter Replacement .
  14. Install the sending unit Refer to Fuel Sender Assembly Replacement .
  15. Add clean diesel fuel to the primary tank until the tank is 1/4 full.
  16. Reconnect the following lines:
    • The fuel filter inlet line
    • The fuel filter outlet line
    • The transfer pump pressure and suction (both ends) lines
    • The fuel return line (tank end)
  17. Connect the fuel filter drain to a line that flows into a clean metal container.
  18. Connect the batteries.
  19. Operate the fuel system hand primer at the fuel filter until clean fuel flows from the fuel filter drain into a metal container.
  20. Close the fuel filter drain and remove the bleeder hose.
  21. Install a hose on the fuel return line near the glow plug relay, and insert other end into a 7.6 liters (2 gallon) metal container.
  22. Crank the engine for 30 second time intervals, with 1 minute cool-down periods. Continue until 3.8 liters (1 gallon) of fuel has passed into the container.
  23. Connect the fuel return line.
  24. Install the ignition 1 relay in the underhood relay center.
  25. Start and run the engine.
  26. Stop the engine.
  27. Clean any fuel spillage from the engine.
  28. Fill the fuel tank and add a biocide, if needed.
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