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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 6 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Repair Instructions) >> 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 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the negative battery cable(s). Battery Negative Cable Disconnection and Connection (Single Battery) , or Battery Negative Cable Disconnection and Connection (Dual Battery)
  2. Remove the fuel sender assembly. Fuel Tank Fuel Pump Module Replacement 
  3. Inspect the fuel tank and the fuel sender for deposits, rust, fungi or bacteria. If any of these are present, replace the contaminated 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.
  13. Install a new fuel filter. Fuel Filter Replacement 
  14. Install the fuel sender assembly. Fuel Tank Fuel Pump Module 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 negative battery cable(s). Battery Negative Cable Disconnection and Connection (Single Battery) , or Battery Negative Cable Disconnection and Connection (Dual Battery)
  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 at the left cylinder head, 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. Connect the fuel return line.
  24. Reconnect the crankshaft position sensor.
  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. Fill the fuel tank and add a biocide, if needed.
  29. Clear the engine control module of any diagnostic trouble codes (DTCs).
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