You need to relieve the fuel system pressure, disconnect the fuel feed and the fuel return pipes from the fuel rail, and then remove the fuel return pipe attaching screw and the fuel return pipe retainer, the fuel return pipe, the fuel return pipe O-ring, the fuel pressure connection core assembly from the crossover pipe rail, the retaining clip attaching screw and the crossover fuel pipe retainer clip, the retaining clip attaching screw and the crossover fuel pipe retainer clip, the crossover pipe rail assembly from the left-hand rail assembly and the right-hand rail assembly and the crossover fuel pipe O-rings.