Fuel Rails
The extruded fuel rail assembly includes a fuel pressure regulator, the 6 individual high pressure fuel injectors, and the cold start injector. The fuel rail assembly seats in the "V" between the upper plenum and the crossover runner section. The injectors fit into individual sockets in the base plate. The fuel rails used on 1.8L, 3.0L and 3.8L engines are manufactured, assembled and flow tested with the injectors as an assembly.
The injectors are force fit into the opening on the rail and a retainer clip is pushed into its locked position. See Fig 1 . The injectors are locked in place with the aid of the injector retainer clip which must be rotated in the proper direction.