Installation Procedure
- Install a NEW copper washer to the fuel injector bore.
- Install a NEW fuel injector O-ring to the injector.
- Install the fuel injectors (1) with brackets (2).
- Install the fuel injector bracket fasteners (1) and tighten to 30 N.m (22 lb ft).
- Install the left fuel injector pipes (2) and tighten to 30 N.m (22 lb ft).
- Install the fuel pipe bracket fasteners (1) and tighten to 10 N.m (89 lb in).
- 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.
- Reposition and connect and the fuel return pipes (1).
- Position the engine wiring harness, and install the engine wiring harness bracket fasteners (1) and tighten to 21 N.m (15 lb ft).
- Install the exhaust gas recirculation bracket. Refer to Exhaust Gas Recirculation Valve Bracket Replacement .
- Install the upper fan shroud. Refer to Engine Coolant Fan Upper Shroud Replacement (4.3L, 4.8L, 5.3L, 6.0L, 6.2L, 7.0L) , Engine Coolant Fan Upper Shroud Replacement (Diesel) .
- If the fuel injectors were replaced, refer to Fuel Injector Flow Rate Programming .
- Prime the fuel system. Refer to Fuel System Priming .
- Start the engine. If the engine stalls, repeat the above step.
- Once the engine starts, inspect for fuel leaks.
CAUTION:
Refer to Fastener Caution .
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.