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Release time: 2021.11.03

I believe many car owners and friends have encountered

That's the discouraged sound of the oil cover

Maybe many car owners are when opening the fuel tank cover，All have been unscrewed for a moment，I heard a sound like Kaose。Generally speaking，This situation appears，It is due to the internal and external air pressure inside the fuel tank，Occasionally，It's normal，But if you refuel, you will hear it，It has to be paid attention to。

Outside the fuel tank，There is an important seabet loginpart called carbon can，is a device that mainly balances the internal and external air pressure。If the sound (abnormal air pressure) occurs for a long time when the oil cover is opened for a long time，It is most likely that there is a problem with carbon can，The oil tank cannot be excreted normally，Leading internal and external gas pressure imbalance，So there will be sound。

Judgment is normal or suspected of failure，Except the frequency (often occasionally)，It also needs to be distinguished: whether it is discouraged or inhaled。seabet appThat description basically has no big problem，Especially at high temperature in summer，Due to too much temperature difference inside and outside the fuel tank，The increase in the temperature of gasoline caused the pressure inside the fuel to become larger，It is normal to have gas leakage when opening the fuel tank cover。

In turn,If you hear the sound of inhalation,It means that the pressure inside the fuel tank is less than external pressure，This situation is likely to be a carbon can or solenoid valve.，It may cause these two consequences:

1. Due to too small internal pressure，It is easy to cause the fuel tank deformation，If it is severe deformation，May not even add oil，Cause to refuel;

2. Due to the fuel tank and outside，The oil pump will be pumped out all the time，Over time, it may cause damage to the oil pump。

The sound of breath usually appears in summer，Because the temperature in summer seabet appis higher，Expansion will occur after the gasoline is heated，Because the vehicle space is fixed，Oil and gas sealing will cause pressure，The pressure inside is greater than the air pressure outside，So there will be a sound when turning on the fuel tank。Actually，The sound appeared at this time，The problem is not big。

If you hear the sound of inhalation when the gasoline cover is turned on，Explain the problem of carbon can or solenoid valves，The pressure in the fuel tank is less than the pressure outside，It may lead to the following two situations:

1、When the pressure in the fuel tank is less than the pressure outside，and outside the outside，Then the oil pump will pump out all the time，Over time, the oil pump may be damaged;

2、If the internal pressure of the long -term fuel tank is less than the external pressure，The fuel tank may deform，serious ones may not even add gasoline。

Summary:The inside of the fuel tank must be positive pressure，It is impossible and not allowed to generate excessive negative pressure。When I heard the sound of inhalation，Old drivers must pay attention to。

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