[turbo23dog]

In my wife's BMW, I used to leave the ignition key in the on position to keep the radio for the wife while I was out pumping the gas. The BMW's computer checks for vacuum breaks in the fuel system on a sked of every 5-10 minutes or so. One day after filling up, the CEL popped on as we left the gas station and I'm thinking damm whats's wrong. We found afterward that if the computer checks for vacuum break while the gas cap is off, well thats a major leak that triggers the CEL. So I always take the key out of the ignition when filling up, just to be safe. I have no idea if this applies to Boxsters but its something I always follow in all my cars anyway.