GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2004 🢒 TopKick C-Series (Conventional) C4/C5 🢒 Engine 🢒 Engine Controls - 6.6L (LB7) 🢒 Fuel Injection Fuel Return Pipe Replacement - Left Side

Removal Procedure

    Object Number: 660477 Size: SH
  1. Remove the lower valve cover. Refer to Valve Rocker Arm Cover Replacement - Lower Left Side in Engine Mechanical - 6.6L (LB7).

    2. Important: Confirm which side of the banjo washers have the largest outer diameter.

  2. Remove the return line bolts from injectors and cylinder head.
  3. Remove the return line from the engine.

Installation Procedure
  1. If the injector sleeve was pulled from the cylinder head when removing the injector(s), refer to Fuel Injector Nozzle Tube Sleeve Replacement in Engine Mechanical - 6.6L (LB7).

    2. Object Number: 660477 Size: SH

    Important: Always install new banjo gaskets on the fuel injector lines and install new copper compression washers to the bottom of the injectors.

  2. Install the return line on the injectors.

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

  3. Install the return line bolts to injectors and cylinder head.

    4. Tighten
    Tighten the return line bolts to 12 N·m (106 lb in).

  4. Install the lower valve cover. Refer to Valve Rocker Arm Cover Replacement - Lower Left Side in Engine Mechanical - 6.6L (LB7).