They are capless. There is a rubber seal on the quarter panel, not the door itself, and this seal comes into contact with the door; hence the residue theory.:doh::doh::doh:... I don't have a cap or seal. Must be different on my 14' vs. yours I guess. I thought all 14's were capless.
There is a valve sealing the neck and lid acts pretty much as an additional seal for rest the space under the cap. The lid uses a rubber seal attached to the opening not the lid itself.I disagree. .the fuel door lid doesn't even come in contact with the filler neck or have a seal to seal neck....:?:?:doh:
When the tank is less than full the vapor is vented to an activated charcoal canistor to meet emissions standards which is also why you don't want to keep filling at the station after the pump clicks off. If you send liquid gas thru the vapor recovery system it will ruin it.Ideal Gas Law only deals with gas phase and no liquid, hence gasoline does not obey the Ideal Gas Law.
I'm not sure it's that wide spread . However on ours(along with many things, Chrysler ended up giving us a lifetime warranty w $0 deductible) the button wasn't even connected at the dash.Also mine is not opening, i can hear the sound but the door is not going out , i think they shoud make recall since it is wide problem.