Installation Procedure

Use the EN-47909 cleaning kit to clean the cylinder head bores.
If necessary, replace the fuel injection fuel rail insulators. Refer to 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 Rail
Courtesy of GENERAL MOTORS COMPANY
To install the fuel injection fuel rail bolts, perform the following steps:

Fig 2: Fuel Rail Bolt Tightening Sequence
Courtesy of GENERAL MOTORS COMPANY

CAUTION: Refer to Fastener Caution .
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).
Connect the wiring harness to the fuel injection fuel rail harness.
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