1. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement.
2. Remove the charge air cooler outlet pipe. Refer to Charge Air Cooler Outlet Pipe Replacement.
3. Remove the fuel filter assembly. Refer to Fuel Filter Assembly Replacement.
4. Remove the fuel filter/heater element housing to fuel feed block fuel hoses. Refer to Fuel Hose Replacement - Fuel Filter/Heater Element Housing to Fuel Feed Block.
5. Disconnect the engine wiring harness electrical connector (1) from the exhaust gas recirculation (EGR) valve.



6. Disconnect the engine wiring harness electrical connector (1) from the fuel injection fuel rail pressure sensor wiring harness extension electrical connector.
7. Remove the fuel injection fuel rail pressure sensor wiring harness extension retainer (3) from the bracket.
8. Remove the engine wiring harness bracket bolts and remove the bracket (2).
9. Reposition the engine wiring harness slightly in order to access the front fuel injection fuel feed pipe.



10. 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.
11. 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.

12. 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
Tighten the fittings to 41 N·m (30 lb ft).

2. Reposition the engine wiring harness as necessary.



3. Position the engine wiring harness bracket (2) to the valve rocker arm cover and install the bracket bolts.

Tighten
Tighten the bolts to 24 N·m (18 lb ft).

4. Connect the engine wiring harness electrical connector (1) to the fuel injection fuel rail pressure sensor wiring harness extension electrical connector.
5. Install the fuel injection fuel rail pressure sensor wiring harness extension retainer (3) to the bracket.



6. Connect the engine wiring harness electrical connector (1) to the EGR valve.
7. Install the fuel filter/heater element housing to fuel feed block fuel hoses. Refer to Fuel Hose Replacement - Fuel Filter/Heater Element Housing to Fuel Feed Block.
8. Install the fuel filter assembly. Refer to Fuel Filter Assembly Replacement.
9. Install the charge air cooler outlet pipe. Refer to Charge Air Cooler Outlet Pipe Replacement.
10. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement.
11. Prime the fuel system. Refer to Fuel System Priming.
12. Start the engine. If the engine stalls, repeat the above step.
13. Once the engine starts, inspect for fuel leaks.