K 1500 Yukon 4WD V8-5.3L VIN Z Flex Fuel (2003)
Fuel Rail: Service and Repair
Fuel Rail Assembly Replacement
Fuel Rail Assembly Replacement (VIN Z (RPO L59))
REMOVAL PROCEDURE
1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief Procedure.
See: Fuel Filter/Fuel Pressure Release
IMPORTANT:The L59 E85 fuel rail is comprised of a material that is compatible with fuel that has a concentration of up to 85 percent ethanol.
The E85 fuel rail also uses an E85 Denso fuel injectors. Because of this, special procedures will be used in servicing the fuel rail and associated
components. The screws that fasten the retaining clips for the crossover pipe to the fuel rails are thread cutting and therefore should NOT be removed
from the fuel rail. The fuel rail will be serviced as an entire component.
An 8-digit identification number (1) is located on the fuel rail. Refer to this model identification number if service or part replacement is required.
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).
