A few years ago I had to make a few errands to run. get some propane for my grill and drop off a few near over due books at the library. I got the tank filled up and snugged it in behind my seat. Then went to the library and dropped off the books and browsed for a little while. Yes, it was sunny and hot out side. I got back in the car and as I closed the door there was this horrendous Swoooooosh!!!!! and the smell of propane. I thought my time had come. I guess the tank was very full and in the hot car, the overflow release valve was set to do it's job when I slammed the car door. I might have had to get some clean undies Lesson learned .... take the books back first next time.