did the air sound stop? or continue the whole trip? did it sound like it was coming form the rear wheel well area?

only thing i can think of is a line to the canister from the gas tank popped off, or cracked. when its hot the gas fumes expand and cause some pressure in the tank, if it blew a line. this air sound would run out of air soon after id think, then set a code for the evap system sooner or later.