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Fuel Tank Car: Function, Components, and How to Maintain It

09 April 2025
Fuel Tank Mobil: Fungsi, Komponen dan Cara Merawatnya

The car's fuel tank is one of the most important components of a car that plays a crucial role in its operation. It can be said that this component has a quite critical function for the car to run. Given its crucial function, it is advisable to take good care of this component. Below, a detailed explanation of the function, components, and maintenance of the fuel tank will be provided. The complete discussion is as follows.

What Is a Car Fuel Tank? And What Is Its Function?

The fuel tank in a car is another term for the fuel reservoir. This component has various functions, including the following.

1. Fuel container

The primary function of the fuel tank is as a container for fuel. This component will hold the fuel that enters the tank or is stored overall. 

2. Prevent fuel spillage

Next, the fuel tank functions to prevent fuel from spilling when an accident occurs. As is known, spilled fuel during an accident can trigger car fires and explosions. To avoid such conditions, the fuel tank is equipped with a one-way valve to block the outflow of fuel during an accident.

3. Ensure the fuel processing in the engine runs smoothly

Furthermore, the fuel tank also ensures that the fuel processing in the engine runs smoothly. The fuel that is channeled to the engine cannot be used directly. The fuel will be drawn by the fuel pump and directed to the combustion chamber for the combustion process. 

4. Minimize emission levels 

In general, fuel is a substance that easily evaporates. The vapor from fuel evaporation certainly contains pollutants that can contaminate the air. However, to minimize the pollutant content, the fuel vapor will first be contained by the fuel tank and then channeled to the canister. The vapor will later be processed again so that it can be used to start the engine.

Components of the Fuel Tank

For the fuel tank to function according to its purpose, it requires assistance from several other components within it. Here are the complete components.

  • Fuel cap
  • Fuel inlet hose
  • One way valve
  • Separator
  • Sub tank
  • Drain plug
  • Fuel strainer
  • Fuel pump
  • Fuel return line
  • Main return line
  • Fuel gauge sender unit
  • Line to canister 
  • Air breather hose

How to Properly Maintain the Fuel Tank

To ensure the fuel tank operates optimally, proper maintenance is required. Here are the methods.

1. Regularly check the condition of the fuel cap

To keep the fuel tank in good condition and functioning optimally, you need to regularly check the fuel cap. If this component is damaged, replace it immediately. If this component is just dirty, you need to clean the dirt with a soft brush and cloth to prevent dirt from mixing with the fuel in the tank.

2. Use the right fuel

To maintain the fuel tank, you also need to use the right fuel according to the specified standards. Because fuel with an octane level below the standard can cause sediment to accumulate in the tank.

3. Regularly drain the fuel tank

It is advisable to regularly drain the fuel tank to remove any sediment that has settled inside. It is best to perform this draining at least every six months.

4. Avoid leaving the engine off for too long

The condition of the engine being off for too long can cause the fuel to go stale, leading to corrosion in the fuel tank. 

Thus, the proper way to maintain the fuel tank that you can follow. Don't forget to have a complete service at Daihatsu workshops, so all components of your car are well-maintained and optimal. 

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