Fuel Pressure Sensor Low Pressure Side
The fuel pressure sensor for the low pressure section of the fuel system has the task of supplying the Engine Control Module (ECM) with the actual fuel pressure (absolute pressure). The signal is used to control the fuel pump control module, which in turn controls the fuel pump in the tank, to a desired fuel pressure.
The sensor, which is a piezo resistor, is grounded in the control module and supplied (5 V) from the control module.
Depending on the pressure, the silicone membrane in the sensor moves which changes the resistance, and thus varies the voltage level of the analogue signal to the control module.
The fuel pressure sensor can be diagnosed by the Engine Control Module (ECM) and the sensor signal can be read off.