Installation Procedure

Use the EN-47909 cleaning kit to clean the cylinder head bores. Fuel Rail and Injectors Cleaning and Inspection
If necessary, replace the fuel injection fuel rail insulators. Fuel Rail and Injectors Cleaning and Inspection
Install the fuel injection fuel rail (1), making sure the fuel injectors seat into the cylinder head evenly.
Fig 1: Fuel Injection Fuel Rail Bolts With Tightening Sequence
Courtesy of GENERAL MOTORS COMPANY

CAUTION:
Refer to Fastener Caution .

To install the fuel injection fuel rail bolts (1), perform the following steps:
1. First Pass: Start ALL bolts by hand, but do NOT tighten.
2. Second Pass: Tighten the outer two bolts by hand to seat the fuel injectors.
3. Third Pass: Tighten the remaining bolts by hand.
4. Final Pass: Tighten ALL bolts in sequence to 25 N.m (18 lb ft).
NOTE:
The fuel injection fuel rail wiring harness is clipped onto the fuel rail.

Install the fuel injection fuel rail wiring harness (1).
Install the fuel injection fuel rail pressure sensor. Fuel Injection Fuel Rail Fuel Pressure Sensor Replacement
Install a NEW fuel feed intermediate pipe. Fuel Feed Intermediate Pipe Replacement
Pressurize the fuel system and inspect for leaks.
Fuel Injection Fuel Rail Noise Shield - Install - Fuel Injection Fuel Rail Noise Shield Replacement