Fuel Pressure Sensor: Description

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 1600BAR (23,200PSI). 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 screws into the fuel rail at the top of the engine. See Fig 1. The ECM uses this sensor to monitor the fuel rail pressure.

Fig 1: SENSOR LOCATIONS

Courtesy of DAIMLERCHRYSLER CORP.

1 - BOOST PRESSURE/INTAKE AIR TEMPERATURE SENSOR

2 - FUEL RAIL PRESSURE SENSOR