GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2009 🢒 Sierra Denali 🢒 Engine 🢒 Engine Controls and Fuel - 6.6L 🢒 Water in Fuel Indicator Sensor Replacement

Removal Procedure

    Object Number: 1871899 Size: SH
  1. Drain the fuel from the fuel filter. Refer to Water-in-Fuel Draining.
  2. Remove the right front wheelhouse liner rear bolts/retainers as required to reposition the rear half of the wheelhouse liner (1) in order to access the water in fuel sensor.

    3. Object Number: 1871640 Size: SH
  3. Disconnect the water in fuel sensor wiring pigtail (2) from the engine wiring harness electrical connector.

    4. Object Number: 1871744 Size: SH
  4. Remove the water in fuel sensor (1) from the fuel filter.

Installation Procedure

    Object Number: 1871744 Size: SH
  1. Install the water in fuel sensor (1) to the fuel filter, and tighten ½ turn after the seal contacts the filter.

    2. Object Number: 1871640 Size: SH
  2. Connect the water in fuel sensor wiring pigtail (2) to the engine wiring harness electrical connector.

    3. Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 1871899 Size: SH
  3. Position the rear half of the wheelhouse liner (1) and install the rear bolts/retainers as required.

    4. Tighten
    Tighten the bolts, if required to 2.5 N·m (22 lb in).

  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.