Sierra Denali AWD V8-6.0L VIN N (2004)
Fuel Rail: Service and Repair
FUEL RAIL ASSEMBLY REPLACEMENT
REMOVAL PROCEDURE
IMPORTANT: An 8-digit identification number (1) is located on the fuel rail. Refer to this identification number when servicing or when part
replacement is required.
1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief Procedure.
2. Remove the wire harness bracket nut (2).
3. Disconnect the evaporative emission (EVAP) purge solenoid electrical connector (1).
4. Disconnect the generator electrical connector (3).
5. Disconnect the following electrical connectors:
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Manifold absolute pressure (MAP) sensor (1)
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Knock sensor (2)
6. Remove the knock sensor harness connector from the intake manifold.