[Formulajones]

I haven't had any issues here in Arizona. I have both cars with charcoal cannisters and older cars before charcoal cannisters became a thing with just a simple vented cap. Never any fuel smell from any of them.

I will say, and not sure I mentioned it before as this is an old thread, on the older cars that use a simple vented gas cap, I searched out NOS caps for those cars as the repop stuff you buy, or the caps sold in stores don't seem to work properly.
It appears to me they only sell post 1970 caps that say "vented" but they technically are really the caps designed for the charcoal cannister cars.