CHECK VALVE (TWO-WAY) CONSTRUCTION/OPERATION [MZI-3.7]

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• Mainly consists of positive and negative pressure valves.
• The valve moves in response to the difference in air pressure between the fuel tank and the charcoal canister sides, thereby changing the path of airflow.
• When the pressure in the fuel tank becomes positive, the evaporative gas path opens drawing evaporative gas from the fuel tank into the charcoal canister.
• When the pressure in the fuel tank becomes negative due to fuel consumption or other factors, the evaporative gas path opens, drawing air from the charcoal canister into the fuel tank.