Fuel filler issue

[Inumbrate]

The fuel filler door on the fuel tank makes a wheezing sound after I shut off my 86 FJ1200? If I open the door the sound stops but when I close the door the tank starts to wheeze again. It will make the noise for a few seconds then stop and restart again, Freaky huh? Any ideas?
Clogged vent perhaps? If so, where is the vent and how should I clean it? Is it a pressurized tank?

[Billy Bananahead]

It used to be called a flapperectomy if i remember. Anyway scroll through this link > https://www.fj1200.info/carbtuning.htm and you'll find out about the thing. HTH.