Tank deaeration — general information (Skoda Octavia 1U)

Gasoline vapors generated in the fuel tank are diverted into a tank containing activated carbon (volume of activated carbon 1.2 dm³) and from there through the shut-off valve to combustion. The quantity is regulated by the filter valve (activated carbon tank). When refueling, this line is closed and opens only when the fuel tank filler cap is tightened.

The valve of the activated carbon filter is constantly open until a flow rate of approximately 3.6 kg/h is reached, depending on the pressure in the suction line. At the same time, the air coming from the purge at idle speed is immediately mixed by the actuator of the throttle valve. Based on the signal from the oxygen probe (lambda) and the control equipment, the control unit determines deviations from the value of lambda = 1 and corrects the mixture ratio.

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