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Home >> Chevrolet >> 2022 >> Tahoe PPV, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (Engine Controls And Fuel - 3.0L (Lm2) Diesel - Repair Instructions (2 Of 2)) >> Repair Instructions >> Fuel System Cleaning >> Cleaning Water from the Fuel System

Cleaning Water from the Fuel System

WARNING: This page is about a different variant/trim than selected.
  1. Disconnect the negative battery cable(s). Battery Negative Cable Disconnection and Connection (9C1, 5W4) , or Battery Negative Cable Disconnection and Connection (KL9)
  2. Remove the fuel sender assembly. Fuel Tank Fuel Pump Module Replacement (Long Wheelbase) , or Fuel Tank Fuel Pump Module Replacement (Short Wheelbase)
  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 or contaminated 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. Disconnect the crankshaft position sensor. Crankshaft Position Sensor Replacement 
  13. Install a new fuel filter. Fuel Filter Replacement (Long Wheelbase) , or Fuel Filter Replacement (Short Wheelbase)
  14. Install the fuel sender assembly. Fuel Tank Fuel Pump Module Replacement (Long Wheelbase) , or Fuel Tank Fuel Pump Module Replacement (Short Wheelbase)
  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 negative battery cable(s). Battery Negative Cable Disconnection and Connection (9C1, 5W4) , or Battery Negative Cable Disconnection and Connection (KL9)
  19. Using the scan tool control function, cycle the fuel pump relay to operate the fuel pump 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 and insert other end into a 7.6 liters (2 gallon) metal container.
  22. Prime the fuel system until 3.8 liters (1 gallon) of fuel has passed into the container. Fuel System Priming
  23. Reconnect the fuel return line.
  24. Reconnect the crankshaft position sensor. Crankshaft Position Sensor Replacement 
  25. Start and run the engine. If the engine does not start, prime the fuel system. Fuel System Priming
  26. Stop the engine.
  27. Clean any fuel spillage from the engine.
    28. WARNING:

    Avoid physical contact with the biocides in order to avoid personal injury.

  28. Fill the fuel tank and add a biocide, if needed.
  29. Clear the engine control module of any diagnostic trouble codes (DTC's).
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