Fuel Rail: Description and Operation

Fig. 11 engine fuel supply manifold:

The fuel supply manifold, Fig. 11, delivers high pressure fuel from the fuel supply line to the injectors. The manifold assembly consists of a single preformed tube with either four or eight injector connectors, a fuel pressure regulator mounting flange, a pressure relief valve and mounting attachments. The pressure relief valve is used for diagnostic testing and bleeding of fuel system pressure.