1. Remove the engine cover. Refer to Engine Cover Replacement.
2. Remove the upper fan shroud. Refer to Engine Coolant Fan Upper Shroud Replacement.
3. If equipped, remove the auxiliary generator. Refer to Auxiliary Generator Replacement.
4. Remove the glow plug module and bracket Refer to Glow Plug Control Module Replacement.
5. Remove the positive crankcase ventilation (PCV) hose/pipe. Refer to Positive Crankcase Ventilation Hose/Pipe/Tube Replacement.
6. Remove the engine harness bracket bolts at the left front of engine and position out of the way.



7. Prior to removing the fuel injector pipes, use compressed air to blow any debris from between the injector line and fittings. Wipe the fittings clean of debris.
8. Spray lithium grease, GM P/N 12346293 or equivalent, between the fuel injector line and fittings to assist in containing any debris during removal.

Caution: DO NOT use compressed air to clean debris from the fuel injector inlet after the fuel line is removed. Using compressed air can allow debris to enter the fuel injector inlet and damage the fuel injector.

9. Remove the fuel injector pipes.

Caution: Ensure proper torquing of the fuel injector line. An under-torqued fuel injector line will not seal properly and an over-torqued fuel injector line may damage the fuel injector fitting. An improperly sealed or damaged fuel injector line or fuel injector fitting will cause a fuel leak.

Caution: Refer to Fastener Caution in the Preface section.




1. Install the fuel injector pipes. Tighten the fittings to 41 N·m (30 lb ft).
2. After installing the fuel injector pipes, clean the injector pipes and apply sealant GM P/N 97720043, at the fittings to prevent moisture and debris from collecting between the line and fitting.
3. Position back engine harness and install bolts to bracket at left front of engine and tighten to 21 N·m (15 lb ft).
4. Install the positive PCV hose/pipe. Refer to Positive Crankcase Ventilation Hose/Pipe/Tube Replacement.
5. Install the glow plug module and bracket. Refer to Glow Plug Control Module Replacement.
6. Install the auxiliary generator. Refer to Auxiliary Generator Replacement.
7. Install the upper fan shroud. Refer to Engine Coolant Fan Upper Shroud Replacement.
8. Prime the fuel system. Refer to Fuel System Priming.
9. Start the engine.

If the engine stalls, repeat the above step.

10. Inspect the fuel system for fuel leaks.
11. Install the engine cover. Refer to Engine Cover Replacement.