GM 89018111
Fuel Rail

The procedure starts by taking out the air cleaner outlet duct followed by pressure relief of the fuel system. The engine wiring harness should have its connectors removed from the evap purge solenoid and generator and MAP Sensor and Ignition Coil and fuel injectors. Each connector should get marked for correct reinstallation. First disconnect engine wiring harness clips along with the negative Battery Cable from the right cylinder head next to the removal of positive crankcase ventilation (PCV) hose and the chassis fuel feed pipe quick connect fitting from the Fuel Rail. The evap tube must be separated from its connection before the Fuel Rail bolts are removed while supporting the Fuel Rail to avoid any damage. Clean the Fuel Rail with a spray type engine cleaner while lifting it evenly to remove the Fuel Rail assembly before discarding the old o-ring seals from the fuel injectors. The new o-ring seals go onto the crossover fuel pipe before the crossover parts are installed with their retainers fastened to 3.8 n.m (34 lb in) torque. Instal new o-ring seals on the fuel injectors before placing them into the fuel rails and using retainers for fastening. Install the Fuel Rail on the Intake Manifold with all injectors properly seated before fastening the Fuel Rail bolts to 10 n.m (89 lb in). Rejoin the evap tube followed by the chassis fuel feed pipe and pcv hose and relocate the engine wiring harness before installing its clips. Perform inspection for leaks when the ignition cycle reaches on and off after reconnecting the negative Battery Cable as instructed. The last step involves putting back the air cleaner outlet duct.

Lubricate and install new O-ring seals on the fuel injectors, then insert the injectors into the fuel rails and secure them with retainers.

Reinstall the EVAP tube and purge solenoid, connect the EVAP tube fittings, and the chassis fuel feed pipe.