Installation Procedure

Install the rebuilt direct fuel injectors (1) to the cylinder heads. Refer to Fuel Rail and Injectors Cleaning and Inspection .

Fig 1: Removing/Installing Rebuilt Direct Fuel Injectors
Courtesy of GENERAL MOTORS COMPANY
Install new direct injector hold down clamps to the injectors.
On the new fuel rail, lubricate the fuel injector cups with silicon free engine oil. Refer to Adhesives, Fluids, Lubricants and Sealers

Fig 2: Identifying Fuel Rail & Bolts
Courtesy of GENERAL MOTORS COMPANY
Carefully place the fuel rail (2) into position, placing the front into the fuel rail over the front injector and rotating the rear downward.
Install the 2 outer fuel rail bolts first, then the 2 inner bolts and hand tighten.
Tighten the fuel rail bolts in the sequence shown:

Fig 3: Identifying Fuel Rail Bolt Tightening Sequence
Courtesy of GENERAL MOTORS COMPANY

CAUTION: Refer to Fastener Caution .
1. Tighten the Bank 1 fuel rail bolts first pass to 12 N.m (106 lb in).
2. Tighten the Bank 1 fuel rail bolts a final pass to 23 N.m (17 lb ft).
Install a NEW fuel rail crossover tube. Refer to Fuel Injection Fuel Rail Crossover Tube Replacement (LLT) .
Install a NEW high pressure fuel pipe. Refer to Fuel Feed Intermediate Pipe Replacement (LLT) .
Install the high pressure fuel sensor. Refer to Fuel Pressure Sensor Replacement - Fuel Injection Fuel Rail .

Fig 4: Removing/Installing Fuel Pressure Sensor From Fuel Injection Fuel Rail
Courtesy of GENERAL MOTORS COMPANY
Connect the fuel injector wiring harness electrical connector (1) from the fuel injectors, fuel rail and fuel pressure sensor.
Inspect for fuel leaks using the following procedure:
1. Turn ON the ignition, with the engine OFF for 2 seconds.
2. Turn OFF the ignition, for 10 seconds.
3. Turn ON the ignition, with the engine OFF.
4. Inspect for fuel leaks.
Install the fuel pipe shield. Refer to Fuel Pipe Shield Replacement .
Install the low side fuel pressure service port cap.
Install the fuel tank cap.