Sprinter 2500 V6-3.0L DSL Turbo (2008)
Fuel Pressure Sensor/Switch: Description and Operation
Fuel Pressure Sensor
Description
DESCRIPTION
The fuel rail pressure sensor monitors and passes on the current fuel rail pressure to the ECM. The non-constant system pressure influences the position
of the sensor diaphragm which alters the sensors electrical resistance.
WARNING: A residual pressure of about 50 to 80 bar (725 to 1160 PSI) remains in the fuel rails after switching off the engine. The
high-pressure system must only be opened after the fuel pressure drops to a safe level.
Operation
OPERATION
The fuel rail pressure sensor measures the current fuel rail pressure and supplies an appropriate voltage signal to the Engine Control Module (ECM). A
fuel pressure solenoid is then actuated by the ECM through a control loop until the desired rail pressure is reached.
