Fuel Pressure Sensor: Description and Operation

WARNING: HIGH - PRESSURE FUEL LINE DELIVER DIESEL FUEL UNDER EXTREME PRESSURE FROM THE INJECTION PUMP TO THE FUEL INJECTORS. THIS MAY BE AS HIGH AS 1600 BAR (23,200 PSI). USE EXTREME CAUTION WHEN INSPECTING FOR HIGH - PRESSURE FUEL LEAKS. FUEL UNDER THIS AMOUNT OF PRESSURE CAN PENETRATE SKIN CAUSING PERSONAL INJURY OR DEATH. INSPECT FOR HIGH - PRESSURE LEAKS WITH A SHEET OF CARDBOARD. WEAR SAFETY GOGGLES AND ADEQUATE PROTECTIVE CLOTHING WHEN SERVICING FUEL SYSTEM.




The fuel rail pressure sensor (2) screws into the fuel rail at the top of the engine. the ECM uses this sensor to monitor the fuel rail pressure.

Review the high pressure fuel system warning.

The fuel flows to the fuel pressure sensor through an opening in the rail, the end of which is sealed off by the sensor diaphragm. Pressurized fuel reaches the sensor's diaphragm through a blind hole. The sensor element (semiconductor device) converts the pressure to an electric signal is mounted on this diaphragm. The signal generated by the sensor is sent to the ECM.