What is a fuel temperature sensor?

The Fuel Temperature Sensor is a sensor that regulates the fuel consumption of a car. It ensures your car’s fuel consumption is at its most efficient level so as to produce enough pressure to power the very many functions in the car.

First of all, we need to understand the way the engine consumes fuel. The fuel pump takes fuel from the fuel tank and passes it to the injector which then drops the fuel into the engine at a proportionate quantity needed for the engine to function optimally.

However, the engine does not determine the quantity of fuel it takes in by itself. This is because the engine cannot know the temperature of a fuel, and this is where the fuel temperature sensors come in. it tells the engine the level of temperature of the fuel so that the engine will then take the amount it needs at a time depending on the fuel temperature.

We also have to understand that what determines the quantity of fuel the engine takes in at a time is the temperature. If the fuel is hot, the engine takes in more fuel at a time, but if the fuel is dense and cold, the amount of fuel intake is very minimal. So with this formula, we can understand why the fuel temperature is very important.

This will also help you to know when to buy fuel. Most people have early morning rush and they forget to buy fuel in the morning. This is not to your benefit as you can see; buying hot fuel in the afternoon is like cheating yourself. You should buy your fuel in the morning. Or any time the weather is cold. I personally do not buy fuel after mid-day.

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So, how do you know if the fuel temperature sensor is bad?

Below are a few obvious signs and symptoms of a bad fuel temperature sensor.

Poor Fuel Economy

One of the first symptoms associated with a problem with the coolant temperature sensor is poor fuel economy. If the coolant temperature sensor goes bad it can send a false signal to the computer and throw off the fuel and timing calculations. It is not uncommon for the coolant temperature sensor to fail and send a permanently cold signal to the computer. This will cause the computer to think the engine is cold, even when it is not, and as a result will use more fuel than necessary. This will reduce fuel economy, and may hinder engine performance.

Black Smoke From Engine

Another symptom of a possible problem with the coolant temperature sensor is black smoke from the vehicle’s exhaust. If the coolant temperature sensor fails and sends a cold signal to the computer, this can confuse the computer and cause it to unnecessarily enrich the fuel mixture. If the fuel mixture becomes excessively rich to the point where the fuel cannot be adequately burned in the combustion chamber, it will burn up in the exhaust pipes and cause black smoke. In severe cases, the black smoke may be considerable enough to warrant not driving the vehicle.

Overheating Engine

Another symptom of a problem with the coolant temperature sensor is an overheating engine. The coolant temperature sensor can also fail in a manner that causes it to send a permanently hot signal. This can cause the computer to incorrectly compensate for a lean signal, which can result in overheating, and even misfires or engine ping.

Check Engine Light Comes On

An illuminated Check Engine Light is another symptom of a potential problem with the coolant temperature sensor. For some vehicles, the computer will set off a Check Engine Light if it detects a problem with the sensor’s signal or circuit. The Check Engine Light will remain on until the issue is addressed.

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The coolant temperature sensor is one of the most important engine management sensors, as its reading plays a key role in calculations which affect engine performance. For this reason, if you suspect that your coolant temperature sensor is having an issue, have the vehicle inspected by a professional technician. They will be able to diagnose your vehicle and determine if you need a coolant temperature sensor replacement.

Informative!