This is a great subject. I was under the impression that the vent on gas tank was to allow air to vent out of the tank when you fill the tank.
I also thought the gas cap on our trucks vented in only one direction, in to allow air to replace the fuel as it is being pumped out by the fuel pump. In addition, it’s second function is to stop sloshing gas and fumes from escaping.
I would love for some of our experts to confirm my beliefs or to set me right!
