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 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 pro-
tective 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 sen-
sor to monitor the fuel rail pressure.
OPERATION
Review the high pressure fuel system warning (Refer to 14 - 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 gen-
erated by the sensor is sent to the ECM.
REMOVAL
1. Disconnect negative battery cable.
2. Remove engine cover (Refer to 9 - ENGINE COVER - REMOVAL).
3. Disconnect fuel pressure sensor electrical connector .
4. Remove fuel pressure sensor from fuel rail.
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FUEL INJECTION - 2.8L DIESEL
KJ