73 duster vented gas tank ?

Here a the thing. People removed everything emissions back in the day. Problem is today’s fuel evaporates very quickly. When the ethanol fuel evaporates- the by product is water. Some sort of check valve to let air in and keep pressure in is better. A “roll over valve” helps. Tanks inc in Iowa sells them. If the car rolls over that open hole will dump gas out.
Syleng1