GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2003 🢒 GMC K Sierra - 4WD 🢒 Engine 🢒 Engine Controls - 6.6L 🢒 Fuel Filter Assembly Replacement

Removal Procedure

    Object Number: 786973 Size: SH
  1. Drain the fuel from the fuel filter. Refer to Water-in-Fuel Draining .
  2. Disconnect the following electrical connectors:
    3. • Water-in-fuel sensor (1)
    • Fuel heater (2)

    Object Number: 660432 Size: SH
  3. Reposition the fuel hose clamps.
  4. Remove the fuel hoses from the fuel filter/heater element housing.
  5. Disconnect the electrical and vacuum lines from the following:
    6. • The exhaust gas recirculation (EGR) valve vent solenoid
    • The EGR valve vacuum sensor
    • The EGR valve solenoid
  6. Remove the fuel filter bracket bolts.
  7. Remove the fuel filter/heater element housing.
  8. Remove the fuel filter bracket from the fuel filter/heater element housing.
  9. Remove the fuel filter from the fuel filter/heater element housing.
  10. Inspect the fuel filter, replace if necessary.

Installation Procedure

    Object Number: 660432 Size: SH
  1. Install the fuel filter to the fuel filter/heater element housing.

    2. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  2. Install the fuel filter bracket to the fuel filter/heater element housing.

    3. Tighten
    Tighten the bolts to 20 N·m (15 lb ft).

  3. Install the fuel filter bracket bolts.

    4. Tighten
    Tighten the bolts to 20 N·m (15 lb ft).

  4. Connect the electrical and vacuum to the following:
    5. • The EGR valve vent solenoid
    • The EGR valve vacuum sensor
    • The EGR valve solenoid
  5. Connect the fuel hoses to the fuel filter/heater element housing.
  6. Reposition the fuel hose clamps.
  7. Prime the fuel system.

    8. Object Number: 786973 Size: SH
  8. Connect the following electrical connectors:
    9. • Water-in-fuel sensor (1)
    • Fuel heater (2)
  9. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  10. Start the engine and inspect for fuel leaks.