2021 Carbon Fuel tank not venting.

[Jerster77]

I have a 2021 keystone carbon 36 that has onboard generator and fuel pump. When I run the generator the fuel tank pops loudly and does not vent properly. The vacuum created starves the generator and shuts it down. I cannot find any information on the tank or how it vents the warmer it is the worse it gets. Any advice would be greatly appreciated.

[skids]

The tiny valve at the middle of the fuel cap? That is how a lot of gasoline tanks are vented.