Don't try to fill your car with gas if you don't want it to break down.

When the car is full of gas, there will be drivers who feel unsatisfied and will ask the staff at the gas station or themselves to continue squeezing the pump nozzle to fill up as much fuel as possible even when the gas pump has automatically turned off.

In fact, this is a fairly common situation, but experts in the transportation industry say that trying to overfill the gas tank can have some unintended consequences.

Gasoline is not only a liquid but also a volatile substance. During operation, gasoline will expand as the temperature increases and if the fuel tank is too full, it will create unnecessary pressure inside the tank.

Today, car manufacturers design excess pressure in the tank to push gasoline vapors into the vehicle's selective emissions control (SCR) system. The vapors from the fuel tank are stored in the SCR system and then returned to the combustion chamber.

If the activated carbon filter is too full, it will cause the emission control system to not function properly, resulting in the emission of many harmful pollutants into the air, contributing to environmental pollution.

But that's not all. When users frequently overfill their gas tanks, the SCR system's activated carbon filter can become overfilled with gasoline vapors, which can create too much pressure on the fuel combustion system, causing these components to malfunction and causing the "Check Engine" light to illuminate on the vehicle's dashboard.

In some serious cases, the activated carbon filter and many engine parts will be damaged and users will have to spend a lot of money to repair and replace them.

Furthermore, the fuel tank is always designed with a pump nozzle so that when the amount of fuel has reached the right level, the pump nozzle will automatically turn off. The excess amount of fuel will be sucked back into the tank through a small tube. This inadvertently causes the person filling the tank to pay more than the actual amount of fuel filled.

In addition, spilling excess fuel is not only wasteful but can also affect the vehicle's performance. At the same time, gasoline reacts with sunlight and evaporates, and people around who inhale this vapor will also be affected by the health.

Not only that, the excess amount of gasoline that spills out will also stick to the surface of the car, affecting the paint of the car. If the car is not washed immediately afterwards, the spilled gasoline will cause yellow stains around the fuel filler neck area, which is very difficult to clean, causing the car to lose its aesthetic appeal.

So what is the point here? It is simple, drivers just need to fill the tank until the pump nozzle of the gas station automatically turns off, avoid trying to pump more than necessary. This will give the gas in the tank space to expand.

By doing so, vehicle owners will not only prevent potential damage to their vehicle’s engine and emissions control systems, but will also create a cleaner environment. It’s a small action that can make a big difference.