•  The check valve maintain the pressure in the fuel tank at constant pressure.

•  The check valve is installed to the fuel tank.

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•  Mainly consists of valve, umbrella, and spring.

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•  The valve moves in response to the difference in air pressure between the fuel tank side and the atmospheric side, thereby changing the path of airflow.

•  When the pressure in the fuel tank becomes negative due to fuel consumption or other factors, the path opens, drawing atmospheric air into the fuel tank.