What is the Fuel Pressure Sensor?
In fuel-injected and diesel engines, fuel rail pressure sensors monitor the pressure in the fuel rail and report the reading to the engine control module. If any drop in pressure is detected, the engine control module compensates so that the fuel pump can restore the proper pressure. A valve regulates this pressure; if the sensor ever fails, you should change it. Sometimes, the entire fuel rail may need to be changed, but the sensor is a weak point in the loop that is more prone to damage.
If the sensor is functioning appropriately, only the amount of fuel that is required to make the engine run appropriately will be delivered. Minimal excess fuel will be circulated back to the tank in the fuel return line.
Bear in mind:
Other problems such as a faulty crank position sensor, cam position sensor, air flow sensor, boost pressure sensor, and temperature sensor can mimic signs of a bad fuel rail sensor.
Starting problems may have innumerable causes that are entirely unrelated to sensors.
How to Fix:
The fuel pressure is bled and battery is disconnected
The faulty fuel rail sensor is removed
The new fuel rail sensor is fixed
The battery is reconnected
The repair is confirmed and the vehicle road tested for proper operation
The fuel rail sensor is not part of a upkeep check, and is only addressed when it fails. If you suspect a problem with your fuel rail sensor or fuel delivery system, have one of your expert mechanics examine and change the fuel rail sensor if necessary.
READ ALSO: HOW TO DO FUEL FILTER REPLACEMENT IN CARS
Common signs indicating you may need to change the Fuel Pressure Sensor:
Car won’t start
Car runs intermittently
Check Engine light comes on and stays on
Importance of this service:
If your fuel rail sensor is defective, you may experience struggle starting the engine or poor performance that could cause trouble in traffic. Have a failed fuel rail sensor changed as soon as you can.