Fuel Rail and Injectors Installation (LTG)

Special Tools 

EN-47909  Injector Bore and Sleeve Cleaning Kit

For equivalent regional tools, refer to Special Tools .

1. Clean the fuel injector bore in the cylinder head using the EN-47909  kit.
   Fig 1: Fuel Rail

   Courtesy of GENERAL MOTORS COMPANY
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.
5. Hand start the 2 outer fuel rail bolts (2) to seat the injectors into the injector bores.
   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.
6. Hand start the remaining fuel rail bolts.
7. Tighten the fuel rail bolts in sequence to 25 N.m (18 lb ft).
   Fig 2: Fuel Rail Bolt Tightening Sequence

   Courtesy of GENERAL MOTORS COMPANY
   CAUTION: Refer to Fastener Caution .
8. Connect the electrical harness to the fuel rail harness connections.
9. Install the fuel injection fuel rail noise shield (1).
   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.