The fuel rail is responsible for the supply of fuel to the fuel injectors.
The fuel pressure sensor ensures that your car’s engine cylinders receive the right amount of fuel at the right pressure. The sensor calculates the pressure and sends the data to the ECU.
The ECU then decides on the correct fuel supply measure. Any malfunction of the fuel pressure sensor can interrupt the engine’s proper fuel flow and cause the engine’s performance to collapse.
5 Bad Fuel Pressure Sensor Symptoms
Sensors in cars are susceptible to damage from the constant exposure to pollutants such as dirt, dust, and heat.
The fuel rail sensor is one such sensor that can be damaged quite easily.
The most common symptoms of a bad fuel pressure sensor are starting problems, check engine light, engine performance and bad fuel consumption.
Here is a more detailed list of the 5 most common symptoms of a bad fuel pressure sensor.
1. Difficulty Starting your Car
As already mentioned, the fuel rail supplies the cylinders with the same fuel. The mechanism that ensures that the fuel rail is efficient is the fuel rail pressure sensor.
If the fuel rail sensor malfunctions, it sends incorrect information to the ECU, which changes the settings, causing the fuel supply to be inadvertently interrupted, and your car takes longer to start.
2. Poor Engine Performance
A defective fuel rail pressure sensor will affect the performance of your ride. If you try to accelerate, your engine will not have an efficient fuel supply, resulting in poor acceleration.
Not only that, if the fuel pressure sensor is faulty, it may output too little information to the ECU, which in turn may increase the amount of fuel being fed into the engine. As a result, you lose fuel and have to fill your car’s tank more frequently.
3. Check Engine Light
This is probably the first symptom you will notice. The check engine light is an indication that something is going wrong in your engine that needs immediate attention.
This light is triggered by the ECU, which detects the defective fuel rail pressure sensor and acts accordingly. Whenever this light comes on on your dashboard, you should make a trip to the nearest mechanic.
You can also read the trouble codes yourself with an OBD2 scanner.
4. Stalling Engine
Improper supply of fuel to the engine will cause an unexpected stall. No matter what you try, the engine will often not start again. If this happens frequently, the fuel rail pressure sensor might not be working properly enough to send the correct information to the vehicle’s onboard computer.
If the ECU is unable to make adjustments, your vehicle is at high risk of developing unnecessary problems.
5. Bad fuel consumption
Another symptom you can notice is a different fuel consumption than you are used to having. It can either be higher fuel consumption or lower consumption than usual – which might sound like a good thing. Your engine will not like this thing in the long run, though!
Fuel Pressure Sensor Location
The fuel rail pressure sensor is located at the fuel rail, which is located near the intake manifold.
In some car models, the fuel rail pressure sensor can also be installed on the fuel line, but this is pretty rare.
Check somewhere under the intake manifold, and I’m sure that you will find the injectors, fuel rail, and the fuel rail pressure sensor.
Fuel Pressure Sensor Replacement Cost
A fuel rail pressure sensor will cost you $50 – $150, depending on your car model. The labor work costs 50$ to 150$. You can expect a total of 100$ to 300$ at a workshop for a fuel pressure sensor replacement.
You can absolutely save money by doing it yourself. Replacement of the fuel pressure sensor is often very straightforward on most car models.
Remember that you will handle fuel, though, which can ignite if you are unlucky and not cautious.
In some car models, you also have to reprogram the fuel pressure sensor and remove the trouble codes with a diagnostic tool after replacement.