It is time for you to know what is a fuel rail pressure sensor, its characteristics and how you can replace them. This element is very important for your vehicle that uses Diesel fuel and even Gasoline because it regulates the pressure. The fuel rail pressure sensor saves you a lot of money with your car and fuel consumption.
Over time you will have to replace the fuel rail pressure sensor because they tend to deteriorate. This sensor is not repairable; it does not need maintenance, only a quick replacement if it shows its faults. To have this sensor present in your vehicle and charge it at the right time, you must know it thoroughly.
What is a fuel rail pressure sensor?
If you wonder, what is a fuel rail pressure sensor you should know that it is a fuel regulator. Many diesel engines have injection sensors that are guided by the electronic control unit. This ECU sets an average time to open your fuel injectors, delivering just the cylinders’ right amount.
The pressure sensor will need to measure the effort your car’s engine needs more accurately to inject fuel. This element must be exact with the amount of fuel it sends to the cylinder. Otherwise, it will turn off your vehicle. If the sensor injects a little more or less fuel than normal, it can cause your vehicle to fail.
Where is the fuel rail pressure sensor located?
You can locate the fuel rail pressure sensor above the rail in your vehicle’s diesel system. These sensors have very sensitive elements inside together with a completely electronic circuit. All the information on the amount of fuel handled by the sensor passes to the control unit (ECU) on the panel of your vehicle.
The fuel that is pressurized passes through a channel inside the sensor’s body to this sensitive part. The pressure that is adjusted to the fuel converts it to an electrical voltage amplified by an electrical circuit. All this goes through the electrical contacts and into the electronic control unit.
The rail pressure sensor is also a sensor that measures tension ruggedly. This sensor works in the hands of a piezoresistive effect in which its resistance to the conductor varies by longitudinal deformation.
The sensitive part inside the sensor is made up of several silicon semiconductors. These semiconductors are connected; they are very small in size but functional. The shape of the sensor allows it to compensate for all effects on temperature.
The sensor will be active as long as your vehicle is turned on and always in sync with the electronic control unit. It is powered by a voltage source that does not exceed 5 volts in power. Its connection system comprises three pins: the output voltage, supply voltage, and the ground line.
Fuel Rail Pressure Sensor Operation
What does a fuel rail pressure sensor do? It regulate the fuel according to the signal sent by the ECU in your car. The voltage generated by the sensor depends on the fuel’s pressure and can vary from 0 to 70 mv. The circuit built into the part will evaluate the signal and send out a fair amount of voltage.
The measurement retained by the fuel rail pressure sensor is between approximately 0 to 1800 bar. Measurement accuracy is essential for this element to work and inject the necessary fuel. For a standard pressure, this deviation intolerance should not be greater than 2%.
According to the injection and its system and the injection pressure, this fuel pressure is 280 to 1800 bar. The signal generated by the pressure sensor forms the closed-circuit that creates all the injection control. If you press the acceleration pedal on the vehicle, the ECU will quickly calculate the fuel’s right amount to meet your goal.
The electronic control unit, together with the fuel rail pressure sensor, calculates the throttle pressure level. This pressure control is focused on the valve or regulator located on the injection pump. Depending on the ECU signal, the valve is controlled, obtaining the necessary pressure for the rail.
Unique Pressure Sensor Features
Among the unique features of the fuel rail pressure sensor are:
- Fast response time
The signal to pass from the electronic control unit on your vehicle’s dashboard to the sensor will only take 2 seconds. You will have full sensor operation with ECU while driving around town.
The rail pressure sensor is very resistant, going from 40 degrees to 130 degrees Celsius. The fuel valve can get very hot, so the sensor must be of high resistance.
You will have a measurement range from 0 bar to 1800 bar in your vehicle with the pressure sensor.
- Injection tension
The voltage that reaches the sensor for fuel injection is from 5 volts to 0.25 volts.
How do I know if the fuel rail pressure sensor is failing? Know some symptoms in your vehicle
If the rail pressure sensor fails in your vehicle, the entire engine will be at a loss for fuel which generates blackouts. The electronic control unit will only work at the range in which the sensor works and indicate warning signals. These sensors are good but not very resistant, so it is common for them to be damaged.
You can change the fuel rail pressure sensor in the hands of a professional in less than 10 minutes. Some symptoms that your rail pressure sensor may have are:
– High fuel consumption
With a faulty rail pressure sensor, you can have fuel leaks in your vehicle. You will be able to consume a whole tank of fuel in half the time you used to have lower mileage.
– The engine will run
When the engine does not work due to a lack of gasoline injection, you should know that the problem is the sensor. This is a degenerative problem that affects your vehicle, so you must correct it to improve fuel injection.
– The engine stops
You may find yourself driving through town, and suddenly, your car stalls without an alert. Lack of fuel injection causes the engine to stall, and the pressure sensor causes this.
– MIL light turns on
You will see how the MIL light or the Check signal turns on the panel inside your vehicle. This light indicates that a fault affects the motor, which may be the rail pressure sensor.
– Your engine loses power
Now that you know what does a fuel rail pressure sensor do is to understand because when it is defective, it makes you lose power. With poor fuel injection, the entire engine circuit falls, so you will lose power while driving.
Fuel Rail Pressure Sensor Replacement
You have to replace the fuel rail pressure sensor as soon as possible not to damage your vehicle’s engine. If you want to change this fuel injector sensor, you will have to comply with these steps:
- You have to confirm the problem with the fuel rail pressure sensor in your vehicle. Check if the check light is on or open your engine’s hood and listen for poor fuel injection. If the sensor is completely damaged, your car will not start.
- Now, you must turn off your car, remove a battery post and get your hands a little dirty to check the sensor. You have to check if the sensor has damaged wiring or the part is completely damaged.
- Before changing the rail pressure sensor, you will have to buy a new part for your vehicle. This part can cost between $ 50 to $ 100, depending on the model of your car.
- You will need to find the fuel rail port on the engine’s side.
- Remove the harness from the sensor to make it easier for you to remove the part.
- You will have to use a series of wrenches to remove the sensor that is on the snap rail.
- Fit the new fuel rail sensor for your vehicle; make sure to screw it tight.
- Reconnect the harness to the sensor and check that the wiring to the electronic control unit is complete.
- Reinstall the post on your car battery.
- Test the new fuel rail pressure sensor in your vehicle at startup.
To know how to replace fuel rail pressure sensor, you will only need to fulfill some basic steps. You can enlist an expert mechanic’s help to change the part if you feel like you don’t have the skills.
If you take your car to the mechanic to change the fuel rail pressure sensor, it can be expensive. On average, a mechanic will charge you $ 300 to $ 500 with the sensor included to use it in your vehicle. The time it will take to replace the sensor is a maximum of 20 minutes without counting other failures in your car.