Whine/hiss From This On Turn Off

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can anyone help me and tell me what this part is?
i have a p0453 code, high fuel tank pressure.
i thought it would be a vacuum leak or canister purge valve, which is located in the fender i believe.

could a bad egr vacuum regulator be the cause of my code or is this a seperate problem

so what is this and could it case a p0453 code/ loss of power

the whine/hiss is most noticeable right when i shut the car off like all the pressure is being relieved
 

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