Diesel CR PRESSURE SENSORS Fuel pressure sensor Common rail fuel Pressure Sensor, commonly referred to as the fuel pressure sensor, it is installed at one end of the oil rail to measure the fuel pressure in the common rail pipe. It is part of the vehicle fuel system and is used to monitor the fuel pressure on the fuel track. The Fuel pressure regulator 499000-6120 sends this signal to the electronic control unit, which then adjusts the vehicle's fuel and time.