fuel rail

The nozzles of all cylinders are connected with a common oil pipe (fuel guide rail), which always has constant pressure. High-pressure fuel injection pump feeds fuel into the fuel rail, and then the fuel rail feeds into the injector. Each injector is connected to the common fuel rail through a high-pressure fuel pipe, and the oil pressure in the system is controlled by an electronic control circuit. Fuel guides remain unchanged throughout the injection process and are freely chosen independent of engine speed and load.