on. This last trip, it never came on with only .6gallons left in the car. It usually comes on when I can fill 15 gallons in it. Last time it came on, I filled 17.1 gallons. Screwy. I'd say, make sure your cap it tight. When you take it off, it should make a relief noise... AHHHHHH
Funny thing is my girlfriend says I'm too fast. Go figure ~jonnyz (DC)