How to solve the problem that the car fuel tank has air pressure?

The reason why the car fuel tank has air pressure may be that the car fuel tank cap regulating valve is blocked; clogged canisters; Solenoid valve damage and other problems. Too high air pressure in the car fuel tank will make it difficult for the car to refuel, and it will be difficult for the fuel to enter the car tank. And if the air pressure of the car fuel tank is too high for a long time, the car fuel tank will be deformed, and the oil pump will also cause necessary damage.

In order to avoid danger, there is a thing called a carbon tank in the fuel tank to keep the air pressure inside and outside the tank balanced, but if there is a problem with the gas tank, you will hear the sound made when the soda bottle is opened.

In fact, when opening the fuel tank, there may be two sounds, one is the sound of gas, the other is the sound of inhalation, the sound of air is similar to the sound of opening the soda, this situation mostly occurs in summer, because the air pressure inside the tank is greater than the air pressure outside the tank, so the moment the fuel tank cover is opened, there is gas running out, producing this sound.

There is also a sound called inhalation, and if you hear this sound when you open the tank cap, it means that there is something wrong with the tank. It may be that there is a problem with the canister or solenoid valve, and the suction sound means that the air pressure outside the fuel tank is greater than the air pressure inside the fuel tank. This is detrimental to the tank.

Because the air pressure outside is large, then the fuel tank may be squeezed out of shape, and in this case, when adding gasoline, it may not be added, in addition, the oil pump will be pumped out due to the influence of air pressure, and the oil pump will also be damaged after a long time.

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.

In fact, the sound of gas usually appears in summer, because the temperature in summer is relatively high, gasoline will expand after heating, because the vehicle space is fixed, the oil and gas inside the seal will be pressurized, and the pressure inside is 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 there is an inhalation sound when it is opened, 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 in the fuel tank is less than the pressure outside, it may cause the deformation of the fuel tank, and if it is seriously deformed, it may not even be able to add oil.

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

If you have this sound when you open the fuel tank cap, you should open the fuel cap after driving for two days; After driving for a few days, when the tank runs out, 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.

There are a variety of reasons for:1.It is the fuel cap adjustment valve of the vehicle's fuel tank that is blocked, which will cause high pressure inside the fuel tank.

2.The vehicle's canister valve is clogged due to fuel volatilization into the canister.

3.The solenoid valve of the vehicle is damaged, and the reason is that it cannot be ventilated normally, resulting in the formation of a circuit. <>

Notes:There is a carbon tank in the fuel tank of the motor vehicle to maintain the air pressure balance inside and outside the fuel tank, when there is a problem with the fuel tank of the motor vehicle, you can check the carbon tank in the fuel tank, see if the carbon tank is damaged, you can check or repair the carbon tank, the problem will be solved after maintenance, and the vehicle can be used normally.

It is normal for a car to have a slight air pressure in its fuel tank. First of all, gasoline is volatile, so it will volatilize continuously when the vehicle is driving. However, the fuel tank is very tightly sealed, and the volatilized gas cannot be discharged, so the gas will come out after the tank is twisted, which is more obvious in summer.

If the lid is opened loud and loud, then there is a good chance that the canister is malfunctioning. The canister is an important part used to balance the air pressure inside and outside the tank, and if the canister fails, a large amount of gas will be ejected when the tank lid is opened. When refueling, if the fuel tank is not full, it will jump the gun in advance.

It is normal for the car fuel tank to have air pressure, because gasoline is a highly volatile fuel, after the fuel tank cover is opened, the gasoline will accelerate volatilization after shaking in the car fuel tank, and a large amount of oil and gas will be generated.

This is a normal phenomenon, gasoline is very volatile. Lying in the fuel tank will continue to evaporate, so there is a certain pressure in the fuel tank, and it will be sprayed out when the fuel tank cover is opened: 1. The temperature of gasoline will also become higher when driving, and there will be a little volatilization, and there will be some gasoline vapor in the fuel tank, and all the pressure will become larger; 2. However, a carbon canister is connected to the top of the fuel tank, which is used to absorb these gasoline vapors, when the pressure is high, it will be absorbed by the carbon canister, and the pressure will be relieved through the carbon canister, and when it is under specific working conditions, it will be sucked into the cylinder and burned; 3. Therefore, it is normal to have a certain pressure in the fuel tank, of course, the pressure is generally not too large, because the fuel tank is a closed container, and the volatilization of gasoline is not large.

When you open the fuel tank cap, there is a sound, it is not necessarily a high pressure, but it may also be a low pressure. If the air pressure is indeed high, be sure to go to a special 4S store for inspection. Hope, thank you!

If the solenoid valve of the activated carbon canister of the car is damaged, it will cause the activated carbon canister to be unable to open and close, which will directly lead to the aggravation of fuel consumption. Why is the canister solenoid valve damaged? First of all, we need to start with the working principle of the canister solenoid valve, which can reverse the symptoms of the damage of the canister solenoid valve, and you will find that it can be verified in reality.

The air pressure in the fuel tank of a car is caused by a clogged air vent in the fuel tank cap.

Normally, after the engine starts, there is an electronic valve in the intake pipe, and there is a gas pipe in the valve that is specially designed to send air to the oil tank, in order to prevent the formation of a vacuum without air pressure in the oil tank, and the oil pump does not pump out the oil.

Although there are air holes in the fuel tank cap, if the evaporation rate is fast, there is no time to exhaust the gasoline vapor, so there will be gasoline vapor rushing out the moment the lid is opened. As long as Peng's voice is not very loud, it is fine, it is normal.

When the air pressure of the fuel tank is too high, the oil circuit should be cleaned or the filter should be replaced in time. Tank cleaning is divided into two steps, internal and external. External:

The main reasons:The high air pressure of the fuel tank is usually caused by the blockage of the regulating valve of the fuel tank cover or the blockage of the ventilation of the carbon tank, which will lead to too high air pressure in the fuel tank, and the pressure difference in the fuel tank makes it difficult to unscrew the fuel tank cover.

The solenoid valve on the pipe between the canister and the engine is damaged. The judgment method is: the activated carbon tank solenoid valve is intermittent work, unplug the activated carbon tank solenoid valve to connect the hose of the carbon tank, wait for the electromagnetic work, block part of the solenoid valve with your hand, if you can feel that the solenoid valve has been inhaling, it means that the solenoid valve is damaged, because the normal situation is intermittent inhalation.

If the solenoid valve is damaged, it will not be able to ventilate normally to form a circuit, and the fuel vapor in the fuel tank will be held and cannot be released, which will lead to high air pressure in the fuel tank.

"High pressure in the fuel tank is a normal scene, usually when the fuel tank cover is unscrewed, there will be a "hiss" of deflating, usually through the one-way valve of the fuel tank cover for pressure adjustment, so that the pressure in the tank is constant, there is a certain air pressure to reflect the good tightness of the fuel tank, if the air pressure of the fuel tank is too large, it is possible that the regulating valve is broken or the fuel tank cover is blocked, or it is possible that the ventilation of the carbon tank is blocked.

This phenomenon should be normal, because there is a certain pressure in the fuel tank, and this sound will appear when the pressure is released when the fuel tank cover is opened. Usually, the pressure is adjusted through the one-way valve of the fuel tank cap, so that the pressure in the fuel tank is constant. However, it is recommended that you go to your local authorized dealer to check whether there is a fault and whether the pressure is too high to ensure driving safety.

First of all, what kind of car are you? It should be noted that the vast majority of cars have two mechanisms for pulling the wire at the fuel tank port and popping open the fuel tank cover, in this case, you can first pull the mailbox cover switch, and then someone will pull the fuel tank port to see if it can be opened.

Causes of high air pressure in a car's fuel tank:

1. The regulating valve of the automobile fuel tank cap is blocked

If the regulator valve of the car fuel cap is blocked, it will affect the air pressure in the car fuel tank is too high. In this case, it should be dismantled and cleaned.

2. Blockage of carbon canisters:

3. Solenoid valve damage:

If the solenoid valve is damaged, the engine piping system of the car can not be ventilated normally to form a circuit, which affects the fuel vapor in the car fuel tank and cannot be released, so the internal air pressure will rise.

The pipe between the oil tank and the activated carbon tank is blocked.

or damage to the solenoid valve on the pipe between the charcoal canister and the engine.

Barometric pressure is the atmospheric pressure acting on a unit area, i.e., the gravitational force exerted on a column of vertical air that extends up to the upper boundary of the atmosphere per unit area. The famous Magdeburg Hemispheric Experiment proves its existence. The international unit of air pressure is Pascal, abbreviated as Pa, and the symbol is Pa.

According to the theory of molecular dynamics, the pressure of a gas is generated by the frequent collision of a large number of molecules against the walls of the container. The collision time of a single molecule on the container wall is very short, and the effect is not continuous, but a large number of molecules frequently collide with the vessel wall, and the force on the vessel wall is continuous, and the ratio of this pressure to the area of the vessel wall is the pressure strength is small.

There are two kinds of measuring instruments commonly used in meteorology: liquid barometer and solid barometer

The barometric pressure record is measured by a barometer or barometer installed in a barometer chamber with little temperature variation and sufficient light, and there are timed barometric pressure records and continuous barometric pressure records. The timed barometric pressure record for manual visual measurement is measured by a moving trough or fixed trough mercury barometer, and the basic station observes 4 times a day and the base station observes 24 times a day. The timed air pressure record of continuous barometric pressure recording and automatic telemetry observation is recorded by using a metal elastic diaphragm box as a sensor, and the barometric pressure record can be obtained at any time.

These instruments are used to measure the air pressure of the station, and the sea level pressure can be calculated according to the parameters such as the height of the sea and the air pressure of the station, the temperature of the air column.

If the air pressure in the fuel tank is too high, on the one hand, it will cause the oil pressure of the oil pump to rise, and on the other hand, it will cause the oil and gas to enter the engine combustion chamber through the activated carbon tank, so it will lead to high fuel consumption of the vehicle.

Hello teacher, it should be that the carbon canister is blocked, thank you [car question, ask the car master. 4S shop professional technician, 10 minutes to solve. 】

The reasons for the air pressure in the automobile fuel tank are as follows: 1. The blockage of the fuel tank cap regulating valve of the vehicle fuel tank will cause the internal pressure of the fuel tank to be large. 2. The blockage of the carbon canister valve of the vehicle is due to the volatilization of fuel into the carbon canister.

3. The solenoid valve of the vehicle is damaged, and the reason is that it cannot be ventilated normally to form a loop. The air pressure solution of the automobile fuel tank is as follows: 1. There is a carbon tank in the fuel tank of the motor vehicle to maintain the air pressure balance inside and outside the fuel tank.

2. When there is a problem with the fuel tank of the motor vehicle, you can check the carbon tank in the fuel tank to see if the carbon tank is damaged. 3. The carbon canister can be inspected or repaired, and the problem will be solved after repair, and the vehicle can be used normally.