K 1500 Suburban 4WD V8-5.3L VIN Z Flex Fuel (2003)
Fuel Rail: Service and Repair
Fuel Rail Crossover Pipe Replacement
Fuel Rail Crossover Pipe Replacement
IMPORTANT:The fuel rail for the 5.3L regular production option (RPO) L59 (VIN Z) engine is compatible with fuel that has a composition of up to
85 percent Ethanol (E85). Because of this, the fuel rail will be serviced as an entire assembly, this includes both left and right rail
assemblies and crossover pipe rail.
REMOVAL PROCEDURE
1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief Procedure.
See: Fuel Filter/Fuel Pressure Release
2. Disconnect the fuel feed pipe and return pipes (1) from the fuel rail.
3. Remove the fuel return pipe attaching screw (3) and the fuel return pipe retainer (2).
4. Remove the fuel return pipe (1).
5. Remove and discard the fuel return pipe O-ring (6).
6. Remove the fuel pressure connection core assembly (24) from the crossover pipe rail (25).
7. Remove the retaining clip attaching screw (22) and the crossover fuel pipe retainer clip (21).
8. Remove the retaining clip attaching screw (4) and the crossover fuel pipe retainer clip (5).
9. Remove the crossover pipe rail assembly (25) from the left hand rail assembly (14) and the right hand rail assembly (15).
10. Remove and discard the crossover fuel pipe O-rings (7, 20).
