Pressure Control Solenoid Valve

The fuel tank pressure control solenoid valve located in the evaporation line between the shut valve on fuel filler pipe and the canister adjusts the pressure inside the fuel tank under the control of ECM.
When the tank internal pressure is increased and becomes greater than atmospheric pressure, the valve is opened to introduce evaporation gas into the canister to purge.
On the other hand, when the tank internal pressure becomes smaller than atmospheric pressure, external air is taken from the drain valve into the canister.
Also, the pressure control solenoid valve can be electrically closed for system diagnosis.