Express 2500 V8-4.8L (2007)
Fuel Rail: Service and Repair
Fuel Rail and Injectors Installation
Fuel Rail and Injectors Installation
Caution: Refer to Fuel Rail Stop Bracket Installation Caution in Service Precautions.
Important: DO NOT use the fuel injector O-ring seals again. Install NEW fuel injector O-ring seals during assembly.
1. Lubricate the NEW fuel injector O-ring seals with clean engine oil.
2. Install the O-ring seals onto the fuel injectors.
3. Install a new O-ring seal to the right side of the crossover tube.
4. Assemble the crossover tube and bolt to the right fuel rail.
5. Install the fuel rail, with fuel injectors, into the intake manifold.
Press evenly on both sides of the fuel rail until all of the injectors are seated in their bores.
6. Apply a 5 mm (0.2 in) band of threadlock GM P/N 12345382 (Canadian P/N 10953489), or equivalent, to the threads of the fuel rail bolts. Refer
to Sealers, Adhesives, and Lubricants.
Notice: Refer to Fastener Notice in Service Precautions.
7. Install the fuel rail bolts.
1. Tighten the fuel rail bolts to 10 N.m (89 lb in).
2. Tighten the crossover tube right side retaining bolt to 3.8 N.m (34 lb in).
8. Install the fuel rail stop bracket and bolt.
Tighten the fuel rail stop bracket bolt to 50 N.m (37 lb ft).
