How does the air pressure in the car fuel tank come from?

The air pressure in the fuel tank of Pacific Auto Network may be caused by the blockage of the regulating valve of the fuel tank cover. The carbon canister is blocked; Damage of solenoid valve and other problems. Too high air pressure in the automobile fuel tank will make it difficult for the automobile to refuel, and it is difficult for the fuel to enter the automobile fuel tank. However, if the air pressure in the automobile fuel tank is too high for a long time, it will deform the automobile fuel tank and cause necessary damage to the oil pump.

Usually, after the tank is filled with gasoline, the air pressure inside and outside the tank is different. In order to avoid danger, there is something called a carbon canister in the fuel tank, which is used to keep the air pressure inside and outside the fuel tank balanced, but if there is something wrong with the carbon canister, you will hear a sound when you open the soda bottle.

In fact, there may be two kinds of sounds when opening the fuel tank, one is the sound of exhaust and the other is the sound of inhalation. The sound of exhaust is similar to the sound of opening soda. This situation often occurs in summer, because the air pressure in the fuel tank is greater than the air pressure outside the fuel tank, so at the moment when the fuel tank cover is opened, the gas runs out, resulting in this sound.

And the sound of inhaling. If you hear this sound when you open the tank cover, there is something wrong with the tank. There may be something wrong with the carbon canister or solenoid valve. The sound of inhalation indicates that the air pressure outside the fuel tank is greater than that inside the fuel tank. This is harmful to the fuel tank.

Because of the high air pressure outside, the fuel tank may be squeezed and deformed. In this case, it may not be added when gasoline is added. In addition, the oil pump will continue to pump oil because of the influence of air pressure, and the oil pump will be damaged after a long time. (Photo/Text/Photo: Pacific Auto Network Chen Miaoling)