Sensor, Fuel Pressure, High Pressure Side
The sensor is included as a unit in the fuel rail. The seal against the fuel rail is a "metal against metal" seal.
The pressurized fuel acts on a diaphragm, which in turn, via the oil, acts against a "sensor chip". The "chip" converts pressure into an electrical variable of 5 V that informs the engine control module (ECM) about the current fuel pressure. The sensor must not be removed from the fuel pipe. In the event of a faulty probe, the fuel rail must be replaced.