Hi guys,
I bought a used 2017 F-Type V6S with 20.000 km, from the first day I noticed that when I open the fuel cap there is a noise of pressure released (sometimes I can see the fuel vapor escaping in the air).
Is this normal? Or I have a faulty purge valve (Topix 303-13)? Could you check if your fuel cap is doing the same?
I have attached a video

 

I get the same occasionally.

 

Isn’t that just vacuum effect rather than positive pressure being released