A fuel tank pressure sensor is a crucial component of a car’s fuel system. As the name suggests, the fuel tank pressure sensor senses the pressure in the fuel assembly. If it detects a drop in fuel pressure, it generates signals to alert the driver of an engine issue.
On the other hand, a bad fuel tank pressure sensor is unable to perform its function, hence impacting the car’s performance. To help you detect a bad fuel tank pressure sensor, we have compiled the signs you should look for.
What is a Fuel Tank Pressure Sensor?
A pressure sensor of the fuel tank is a component of the fuel pump assembly. It is a part of the EVAP – Evaporative Emissions Control System, which captures unburnt fuel vapours and transfers them back to the fuel system for utilisation.
The pressure sensor is located at the top or inside the fuel tank. The basic function of a fuel tank pressure sensor is to detect the pressure in the fuel system. It helps you detect leaks in the fuel system and enhance fuel economy.
How Does a Fuel Tank Pressure Sensor Work?
The fuel tank pressure sensor operates in conjunction with the engine control module. It relays all the accumulated data to the engine control module. In this manner, if the fuel tank pressure sensor detects a problem in the fuel system, it will send signals to the engine control unit which in turn illuminates the check engine light as a car dashboard warning light.
What are the Symptoms of a Faulty Fuel Tank Pressure Sensor?
A bad fuel tank pressure sensor when left untreated for a long period can lead to engine damage. Detailed below are the symptoms of a bad fuel tank pressure sensor.
The engine warning light illuminates
There are various reasons why a check engine light displays on a car’s dashboard. A malfunctioned fuel tank pressure sensor can cause the check engine light to turn on. For that reason, a car diagnostic code of P0452 is logged by the car computer.
Bad fuel mileage
You might experience bad fuel mileage among the bad fuel tank pressure sensor symptoms. This is because a bad fuel tank pressure sensor will send false information to the car’s computer concerning fuel usage.
If the control unit is unaware of the car’s fuel usage and fuel required to maintain optimal performance, it will eventually consume more fuel. It will result in poor engine performance and acceleration and low mileage.
Engine stalling
One of the signs of a bad fuel tank pressure sensor is engine stalling. The car computer uses information from the pressure sensor to calculate the air and fuel ratio for combustion. An incorrect pressure reading can disrupt the ratio leading to improper combustion which further results in engine stalling.
Hard engine starts
Since a bad fuel tank pressure sensor can disrupt the combustion process, it can also make it difficult for the engine to start. It results from an improper ratio of fuel and air in the combustion chamber which is caused by false readings by the faulty fuel tank pressure sensor.
How to Test a Fuel Tank Pressure Sensor
You may test a fuel tank pressure sensor using a multimeter or a voltmeter. A fuel tank pressure sensor has three wires including a ground wire, a wire that connects with the control unit and another that returns signals from the unit.
If the sensor is located above the fuel tank it will be easier to test it. Whereas, if it is located inside the tank, you might have to get it tested by a professional car mechanic.
After you have located the fuel tank pressure sensor, test it by following these steps.
- Unplug the wire harness.
- Now connect the voltmeter or the multimeter to it.
- Once the reading stabilises on the meter, compare it with that specified in the owner’s manual.
If both readings are similar, your fuel tank pressure sensor is working fine. On the other hand, if the readings are different, you will have to get the sensor replaced immediately.
That’s a wrap for the symptoms of a bad fuel tank pressure sensor. The fuel tank pressure sensor is a car component most motorists are unaware of. If it is working fine, it can save you from burning a hole in your wallet and enhance engine performance.
Make sure to track your car maintenance schedule and get the car maintained timely for a healthy performance. Despite timely maintenance, if your car is posing recurrent issues, it is better to switch to another car. If you are looking for a modern car with high-tech features, try exploring these used cars for sale in the UAE.
Stay tuned to the UAE’s leading car blog for more information on car parts and accessories.
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