Is it normal for a car to have a sound of air pumping in after the fuel cap is opened?

When the handle is opened when refueling, a sound similar to breathing can be heard. If you refuel at a gas station, some employees may take the opportunity to sell fuel tickets. It is said that as soon as the lid of the car is opened, the oil and gas will flow backwards, and if the oil and gas flow backwards, you will have to add some fuel treasures.

Is oil and gas counterflow related to fuel treasures? It doesn't seem to matter, people say so, today Brother Meow is here to explain to you why there is a sound.

The first is the sound of opening the outside air into the fuel tank at this time. In this case, it is usually refueled when running at high speed or running longer distances. Because the fuel tank is full, the flow rate of running high-speed distances during the vehicle is relatively long, so the flow of the fuel tank is getting less and less.

If the outside air can't enter the fuel tank, the fuel tank will form a negative pressure and the fuel tank will be flattened, causing your oil pump to not be able to absorb the oil. Therefore, it is necessary to design a one-way valve in the fuel tank cover area. That is, air can flow into the fuel tank from the outside, but it cannot leak out of the fuel tank.

Many cars have one such small hole in the middle or next to the fuel tank cap, which is the air intake. It can only prevent air inflow and oil leakage. The flow rate is large or the car is long in a short time, and the one-way valve is blocked or the one-way valve is not good.

At this point, if the inhalation rate is not so fast, negative pressure will be generated inside the fuel tank. The greater the negative pressure, the more you open the lid to make this breathing sound.

Another case is the sound of exhalation. The reason is also very simple, when you open the lid, you get close to the side and smell a little smell. The moment the lid is opened, the sound is loud, and the oil and gas are released, and the reason for the sound may not be inhalation or exhalation, but the oil and gas in the fuel tank making such a sound.

Gasoline is volatile, some cars are older, the absorption capacity of the carbon canister is not strong, the weather is hot, and the oil in the fuel tank is more volatile. Since the volatile oil and gas are not absorbed by the carbon tank in time, a small positive pressure will be formed in the fuel tank at this time, so the pressure in the moment when the fuel tank cover is opened will be greater than the pressure outside, so it will release oil and gas. There is a deflate sound on the fuel tank cap, please be careful!

The way to tell whether to breathe or exhale is also very simple. If you can't smell the gasoline, you can basically conclude that it is inhalation. If the gasoline smells strong, it can be concluded that it is basically exhalation.

Every time you exhale, the canister may really not work, so replace the canister in time. On the contrary, every time you refuel, the inhalation sound inside is loud, which means that if there is a problem with the one-way valve, the one-way valve needs to be repaired. One-third of the web** can buy this lid.

Because it is a plastic seal.

After the fuel tank cap is opened, the reason for the gas is that gasoline is a highly volatile fuel, and it will accelerate volatilization after shaking in the car fuel tank, and a large amount of oil and gas will be generated.

Normal. Because the car's fuel tank is sealed, as the gasoline is consumed, the pressure inside becomes smaller, so it is normal for there to be a sound of air pumping.

Normal. Because the car's fuel tank is not full, it makes this sound, so it is normal.

It is normal to open the tank cap and have gas spewsGasoline itself is a volatile liquid, and there is a certain amount of gasoline vapor in the tank. Since gasoline is a volatile.

Liquids, it is not safe to design the tank to be sealed, but it is environmentally polluting to vent gasoline vapors directly into the atmosphere.

The canister system is designed to absorb gasoline vapor in the tank, and when the engine is not starting, the canister can absorb the gasoline vapor in the tank. After the engine starts, the canister solenoid valve.

will open so that the gasoline vapor inside the canister can enter the combustion chamber from the intake manifold and participate in the combustion. This does not waste fuel or pollute the environment.

When you go to a gas station to refuel in the summer, gas may escape after opening the tank cap. When going to refuel in summer, be careful not to unscrew the fuel tank cap quickly, but slowly rotate and unscrew it, so that a part of the gas can be released. If you unscrew the tank cap all at once, the gas inside the tank may pop the tank cap open and cause injury.

First of all, when you open the tank cap, there is an air spurt, which mostly happens in the summer, which is normal. Gasoline is a highly volatile liquid state, in the hot summer, the fuel tank is closed to the outside world under normal conditions, to prevent oil and gas from escaping, the oil pump in the fuel tank will also produce heat, gas and liquid will expand when heated, and the expansion rate of gas is greater than that of liquid, but the entire tank space is closed.

When you open the fuel tank cap, there is a deflating sound for the following reasons:The first case is a blockage of the canister snorkel. We all know that gasoline is very volatile, when the fuel tank pressure rises, the danger is very high, so the designer has developed a fuel evaporation control system, in which the carbon canister is used to adsorb the evaporated gasoline, after the carbon canister is blocked, there will be abnormal pressure in the fuel tank, you can check it regularly, and put the activated carbon accumulated on it.

Or the dirt is cleaned up, this situation is caused by the volatilization of gasoline, so you don't need to be too nervous.

The second case is when the inside of the tank is under negative pressure. When driving, the carbon canister solenoid valve.

It is in an open state, convenient for the carbon canister to continuously adsorb volatile gasoline vapor, if you screw the fuel tank cap, hear the sound of gas, it means that the inside of the fuel tank is in a negative pressure state, especially after long-distance driving, this situation is more common, the solenoid valve is opened for a long time, the fuel tank can not be replenished in time with gasoline vapor, the air can not fill the fuel tank, the fuel tank will slowly become a vacuum state, and the amount of gasoline will be less obvious.

The third scenario is hot weather.

Gasoline expands when heated. You can observe that usually the sound of deflation will appear in summer, which is due to the relatively high temperature in summer, gasoline expands after heating, and there is a certain pressure in the fuel tank, which is often greater than the air pressure outside, so when the fuel tank cover is unscrewed, there will be a deflation sound, which is not a big problem.

I believe that many car owners have noticed this problem, there is a big sound of air when opening the fuel tank cap, why?

As the gasoline is constantly consumed, the tank gradually becomes empty and the internal pressure becomes less. Without a pressure regulating device, the tank would have been flattened by atmospheric pressure. Therefore, a one-way valve is designed on the fuel tank cap of the vehicle to allow outside air to enter the fuel tank and balance the pressure inside and outside the fuel tank.

Gasoline is volatile, and the volume in the tank expands when gasoline becomes gaseous, resulting in excessive pressure in the tank.

If gasoline vapor is emitted directly into the atmosphere, it will not only pollute the air, but also waste resources. Jet sound generally occurs in the summer, because the temperature is relatively high in the summer, and the gasoline expands when heated. Because the space inside the car is fixed, there will be pressure in the sealed oil and gas, and the pressure inside is greater than the air pressure outside, so there will be a sound when the fuel tank is opened.

To solve this problem, the engine is equipped with a fuel evaporation control system.

Let's analyze why there is a sound. In fact, it is mainly caused by the difference in pressure inside and outside the fuel tank. Normally, the carbon canister in the fuel tank of a car has the function of ventilation and balancing the internal and external air pressure.

When there is a problem with the canister, if the tank cap does not have a pressure relief function, it will cause a pressure imbalance. In fact, the sound of exhaust generally appears in summer, because the temperature is relatively high in summer, and gasoline will expand when heated.

Because the space of the vehicle is fixed, the sealed oil and gas will have pressure, and the pressure inside is greater than the air pressure outside, so there will be a sound when the fuel tank is opened, and the sound that appears at this time is not a big problem. When the pressure inside the fuel tank is less than the outside pressure, it can cause the fuel tank to deform. If it is severely deformed, it may not even be filled with oil.

When the pressure inside the oil tank is less than the pressure outside, and there is no ventilation outside, the oil pump will be pumped out all the time, which may lead to damage to the oil pump over time.

In this case, the fuel tank vaporizes due to the heat, but the tank exhaust hole is blocked and cannot be discharged, so this sound occurs when the lid is opened.

Because the air pressure inside the fuel tank is less than the air pressure outside, a certain air pressure difference is generated.

When refueling the car, there is a certain danger of not opening the fuel tank cap, when refueling the car, because the oil in this fuel tank will be overtaken to the engine, so there will be a certain sound, which is normal.

The treatment method of opening the fuel tank cover with suction sound is as follows: 1. When opening the fuel tank cap, there is an inhalation sound, which may be due to the fault of the carbon tank or solenoid valve, so that the pressure in the fuel tank is less than the pressure outside, so as to make an inhalation sound. If you only hear it occasionally, then it is normal, and if there is a sound often, you need to go to the auto repair shop to check and repair it quickly.

2. Under normal circumstances, the carbon canister in the automobile fuel tank has the effect of ventilation to balance the internal and external air pressure. After the drawbacks of the canister, if the fuel tank cap loses its pressure relief effect, it will cause pressure imbalance. 3. Then the fuel tank cover can not be relieved, resulting in unbalanced pressure in the surface, so there is such a sound when it is open.

The internal air pressure of the fuel tank is less than the external air pressure, which will lead to the deformation and damage of the fuel tank, when the pressure inside the fuel tank is less than the outside pressure, it may cause the deformation of the fuel tank, if it is seriously deformed, it may not even be able to add oil. It even leads to the inability to refuel! This can lead to damage to the oil pump for a long time.

4. If you hear a "gasping sound", it is basically a normal situation. The "gas sound" is mainly presented in summer, due to the high temperature in summer caused by the expansion of gasoline, because the fuel tank space is immutable, the oil and gas inside will be under pressure, when the internal pressure is greater than the outside, as long as the fuel tank cover is opened, the gasoline inside will run out, so there will be a "gas sound."

<> "When you open the fuel tank cap, there is an inhalation sound.

I don't know if you have noticed that the moment you open the fuel tank cap, there is a sound of gas, like boiling beer. If there is one or two times in a while, there is no need to worry, if every time you open the fuel tank cap there is such a gas sound, then the owner needs to pay more attention.

First of all, analyze why there is a sound, in fact, it is mainly caused by the difference in pressure inside and outside the tank. Usually, the carbon canister in the fuel tank of the car has the effect of ventilation to balance the internal and external air pressure.

When there is a problem with the canister, if the fuel tank cap does not have the effect of relieving the pressure, it will lead to a pressure imbalance.

In fact, the sound of gasoline usually appears in the summer, because the temperature in the summer is relatively high, and the gasoline expands when heated.

Because the space of the vehicle is fixed, there will be pressure on the oil and gas inside the seal, and the pressure inside will be greater than the air pressure outside, so there will be a sound when the fuel tank is opened. Actually, the sound that appeared at this time was not a big problem.

If the canopy is opened with an inhalation sound, it means that the pressure inside the tank is less than the pressure outside. In this case, it is very likely that the canister or solenoid valve is faulty. When the pressure inside the tank is less than the pressure outside, there are two possible hidden dangers:

1.When the pressure inside the fuel tank is less than the pressure outside, it may cause the fuel tank to deform, and if it is seriously deformed, it may not even be able to add oil.

2.When the pressure in the oil tank is less than the pressure outside, and the outside is not ventilated, the oil pump will continue to pump out, which may cause the oil pump to be damaged over time.

So how can you judge this gas? If you have this sound when you open the fuel tank cap, you should open the fuel cap after driving for two days; And then after driving for a few days, wait until this tank of oil is used up, if you use this sound every time, it can basically be judged to be negative pressure. If that's the case, then it's time to get it repaired.

After the car has been used for a long time, it is inevitable that there will be various small problems, such as opening the accelerator cover and there is an inhalation sound, what is going on?

If there is an inhalation sound when opening the car fuel tank cap, it may be that the solenoid valve or carbon canister is malfunctioning, which means that the air pressure in the tank will be less than the outside air pressure, and there will be an inhalation sound when the throttle cap is about to be opened. If the inhalation sound is only occasional, not often heard, it is also normal, if the inhalation sound is heard frequently, then the owner friends will have to go to the 4S shop or car repair shop to check and repair.

The carbon canister of the car is a kind of ventilation device, so that the internal air pressure and the external air pressure are balanced, when the carbon canister fails, the ventilation effect is affected, then the air pressure is unbalanced, resulting in the fuel tank cap can not be relieved, and the suction sound will occur. If the air pressure inside the fuel tank is smaller than the air pressure outside, it will cause the deformation of the fuel tank to be damaged, and when the fuel tank is seriously deformed, it may cause the car to fail to refuel, or even cause the fuel pump to be damaged.

What is the reason for the suction sound when the fuel tank cap is opened The reason why there is an inhalation sound when the fuel tank cap is opened: 1. The carbon canister in the automobile fuel tank has the effect of ventilation to balance the internal and external air pressure. When there is a problem with the canister, if the fuel tank cap does not have the effect of relieving the pressure, it will lead to a pressure imbalance. 2. In fact, the sound of gas usually appears in summer, because the temperature in summer is relatively high, and the gasoline will expand after heating, because the vehicle space is fixed, the oil and gas inside the seal will be under pressure, and the pressure inside will be greater than the air pressure outside, so there will be a sound when the fuel tank is opened.

Actually, the sound that appeared at this time was not a big problem. 3. If there is an inhalation sound when opening, it means that the pressure inside the fuel tank is less than the pressure outside. In this case, it is very likely that the canister or solenoid valve is faulty. 2019