Fuel Rail and Injectors Installation (LTG)

Special Tools 

EN-47909  Injector Bore and Sleeve Cleaning Kit

For equivalent regional tools, refer to Special Tools .

Fig 1: Fuel Rail
Courtesy of GENERAL MOTORS COMPANY
1. Clean the fuel injector bore in the cylinder head using the EN-47909  kit.
2. Replace the fuel rail insulators, if necessary. Refer to Fuel Rail and Injectors Cleaning and Inspection . Replace the fuel rail bolts, if necessary.
3. Replace fuel injector Teflon seals with NEW when transferring fuel rail and injectors on to service engine assembly. Refer to Fuel Rail and Injectors Cleaning and Inspection .
4. Install the fuel rail (1) with injectors into the cylinder head evenly.
NOTE:

Mount the bolts evenly to avoid cocking of the fuel injectors during installation.

NOTE:

Avoid contamination and contact damage of fuel injectors nozzle tips.

5. Hand start the 2 outer fuel rail bolts (2) to seat the injectors into the injector bores.
6. Hand start the remaining fuel rail bolts.
Fig 2: Fuel Rail Bolt Tightening Sequence
Courtesy of GENERAL MOTORS COMPANY
CAUTION:

Refer to Fastener Caution .

7. Tighten the fuel rail bolts in sequence to 25 N.m (18 lb ft).
8. Connect the electrical harness to the fuel rail harness connections.
Fig 3: Fuel Injection Fuel Rail Noise Shield
Courtesy of GENERAL MOTORS COMPANY
NOTE:

Replace the noise cancelling foam component if it is exposed to and has absorbed automotive fluids.

9. Install the fuel injection fuel rail noise shield (1).