The main function of the fuel rail consists in the optimal distribution of the fuel (gasoline, methane, etc.) to the injectors in the high or low pressure supply systems of endothermic engines.
It consists of a duly sized piping that fits the injector housings, the fixing brackets to the air intake manifold or to the motor cylinders head, connections for fuel inlet and, if necessary, fuel recirculation in the tank, the housings for the fuel temperature and pressure sensors, the housing for an internal discharge control valve, if necessary, and the supports for the electrical wirings of the assembled electromechanical components.
The fuel rail for GDI gasoline engines is made in steel with high mechanical, resistance.
The operating pressure is obtained and maintained through a pressure regulator that can be is incorporated into the rail (systems equipped with fuel recirculation) or in the high pressure fuel pump.
Rail design is based on instantaneous flow rate control requirements