Marty; when gas is underground at the station, it will be probably 40-50 degrees. It then comes into your car and gets sealed up by the cap. Seeing as how it is Summer, that gas will get hot real fast and start to expand. When I worked at a station, many moons ago, a guy filled up his car and forgot his dough. He parked the car on the side and waited for the old lady. Next thing you know gas is running out his tank and the cap is a couple of feet away.....Russ ____________________________________________________ Start your day with Yahoo! - make it your home page http://www.yahoo.com/r/hs