I havent noticed anything but i still have yet to drive the damn truck. She is still sitting in the garage. Dont quote me but i think the tank is able to vent thru the fuel filler neck
All newer gas caps have tank ventilation built into the cap. I'm not 100% sure about the older caps on these trucks but I would be almost positive your gas cap has some form of gas tank ventilation.
That's a good question. I would think so, since the lock is just there for anti siphoning and such.It's really just a one way check or flapper valve so most gas caps probably have them