Instructions of Removal and Installation for a Duramax Diesel Pickup Fuel Filter 
Removal Procedure
  1. Drain the fuel from the fuel filter. Refer to Water-in-Fuel Draining. 
  2. Remove the right side wheel house liner. Refer to Front Wheelhouse Liner Replacement - Right Side GMC Front Wheelhouse Liner Replacement - Right Side Chevy
  3. Disconnect the water-in-fuel sensor wiring pigtail (2) from the engine wiring harness electrical connector.
  4. Remove the fuel filter from the fuel filter adapter.
  5. Remove the water-in-fuel sensor from the fuel filter.
  6. Note:
    Inspect the fuel heater element housing for contamination. Contamination on the fuel heater element housing may cause leakage at the fuel filter. Coat the fuel filter seal with clean engine oil
Installation Procedure 
  1. Install the water-in-fuel sensor to the NEW fuel filter, and tighten 1/2 turn after the seal contacts the filter.
  2. Install the NEW fuel filter to the fuel filter adapter, and tighten 1/4 turn after the seal contacts the filter adapter.
  3. Connect the water-in-fuel sensor wiring pigtail (2) to the engine wiring harness electrical connector.
  4. Prime the fuel system. Refer to Fuel System Priming 
  5. Start the engine. If the engine stalls, repeat the above step.
  6. Once the engine starts, inspect for fuel leaks.
  7. Install the right side wheel house liner. Refer to Front Wheelhouse Liner Replacement - Right Side GMC Front Wheelhouse Liner Replacement - Right Side Chevy
Toxic Diesel Performance 
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Fuel Filter Life Reset

This message will appear when a reset is performed either by using the steering wheel controls or following manual procedure.
  1. Reset the fuel filter monitor.
  2. For vehicles with steering wheel controls, press and hold the select button for 5 seconds while the FUEL FILTER LIFE message is displayed.
This message will appear on the driver information center (DIC) for ten seconds.
  1. For vehicles without steering wheel controls, do the following:
  1. Without pressing the pedals, turn the ignition key to the ON position without starting the engine.
  2. Wait 5 seconds.
  3. Completely press the brake and the accelerator pedals simultaneously and hold for 10 seconds. The system is now reset.
  4. Turn the ignition key OFF.
  1. The next time the engine is started, the message will no longer be displayed.
ALWAYS reset the FUEL FILTER LIFE system after a fuel filter change.
                                                 
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