Yukon/Denali XL 1500 2WD V8-5.3L VIN Z Flex Fuel (2004)
17. Remove the fuel injector lower O-ring seal (4) from each injector, if necessary.
18. Discard the O-ring seal.
INSTALLATION PROCEDURE
1. Lubricate the NEW fuel injector lower O-ring seals (4) with clean engine oil.
2. Install the NEW O-ring seals (4) onto each injector, if necessary.
3. Install the fuel rail.
4. Apply a 5 mm (0.020 in) band of threadlock, GM P/N 12345382 (Canadian P/N 10953489), or equivalent, to the threads of the fuel rail bolts.
NOTE: Refer to the Fastener Notice in Service Precautions.
5. Install the fuel rail bolts.
Tighten the bolts to 10 N.m (89 lb in).
