K 2500 Yukon 4WD V8-6.0L VIN U (2000)
Fuel: Service and Repair
Fuel System Cleaning
FUEL TANK CLEANING
IMPORTANT:
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Only use oil tree compressed air to blow out the fuel pipes.
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Inspect the fuel tank internally and clean the fuel tank if you find a plugged fuel filter.
CAUTION: Refer to Battery Disconnect Caution in Cautions and Notices.
1. Disconnect the negative battery cable.
2. Relieve the fuel system pressure. Refer to Fuel Pressure Relief Procedure.
3. Drain the fuel tank. Refer to Fuel Tank Draining Procedure (Pickup) or Fuel Tank Draining Procedure (Utility with Single Tank) or Fuel
Tank Draining Procedure (Utility with Dual Tanks - Front Tank) or Fuel Tank Draining Procedure (Utility with Dual Tanks - Rear
Tank).
4. Remove the fuel tank.
5. Remove the fuel sender assembly.
6. Inspect the fuel pump strainer. Replace a contaminated strainer and inspect the fuel pump.
7. Inspect the fuel pump inlet for dirt and debris. Replace the fuel pump if you find dirt or debris in the fuel pump inlet.
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.
8. Flush the fuel tank with hot water.
9. Pour the water out of the fuel sender assembly opening. Rock the tank to be sure that removal of the water from the tank is complete.
10. Install the fuel sender assembly.
11. Install the fuel tank.
12. Refill the fuel tank.
13. Install the fuel filler cap.
14. Connect the negative battery cable.
15. Inspect for leaks.
15.1. Turn the ignition ON for 2 seconds.
15.2. Turn the ignition OFF for 10 seconds.
15.3. Turn the ignition ON.
15.4. Inspect for fuel leaks.
