Fuel Injection Fuel Return Pipe Replacement - Right Side for GMC Truck TopKick C-Series (Crew) C4/C5 2003

1. Remove the upper valve cover. Refer to Valve Rocker Arm Cover Replacement - Lower Right Side in Engine Mechanical - 6.6L (LB7).

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.

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).




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.

Notice: Refer to Fastener Notice in the Preface section.

3. Install the return line bolts.

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

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