Diesel Fuel Pressure Sensor

The fuel injectors supply fuel directly to the combustion chambers of the engine.

Diesel fuel pressure sensor.

Followed by delphi and siemens and then denso the fuel pressure sensor signals the pressure in the fuel rail to the ecu. The fuel rail pressure sensor in the common rail 6 7l diesel measures the pressure of the fuel supplied to the fuel injectors. Naturally if the pressure is not according to the manufacturer s recommendations you will experience little to no response from the car s engine. The fuel pump receives the fuel from the fuel tank and throws it into the fuel rail which transfers the liquid into the cylinders using the knowledge of the fuel pressure sensors.

Most of the potential problems in a modern common rail diesel system engine can be explained by a drop in fuel pressure or engine compression insufficient fuel supply or fuel contamination. The pcm is the main computer of a vehicle. It is a part of vehicle s fuel system and designed to monitor the fuel pressure that is present at the fuel rail. This pressure is monitored by a pressure sensor and the difference between the nominal rail pressure value and the measured one is the input signal for the controller.

The fuel pressure sensor 4 provides a voltage signal to the ecm to indicated fuel rail pressures. The high pressure fuel is supplied to the fuel injectors 1 through separate high pressure pipes. The pump maintains the rail pressure by continuously delivering fuel to the common rail. The fuel pressure sensor senses the amount of fuel in the fuel rail by reading the internal pressure of the rail.

The fuel rail pressure sensor provides feedback to the ecm which regulates the rail pressure by varying the volume of fuel delivered by the high pressure pump and or controlling the flow of excess fuel from the rail to the fuel return system. The fuel rail sensor commonly referred to as the fuel pressure sensor is an engine management component that is commonly found on diesel and some gasoline injected vehicles. In european cars the most common make is bosch. The major culprits are likely to be the fuel injectors high pressure pump fuel filter fuel pressure sensor or regulator glowplugs or crankshaft sensor.

It can then send an electronic message to the pcm telling it precisely how much fuel needs to be released into the engine. This pressure signal is used by the pcm to adjust the fuel injector pulse width and duration while metering fuel to each cylinder during the combustion cycle.