Good question. I really don't know as it was getting dark when I fillied it. I was talking to a guy who pulled up to admire my car just as I finished filling the tank. While I was talking to him, I noticed fuel leaking from around the tank. I looked under the car and saw that it appeared to be coming from more than one location, but I coulnd't be sure. At first I thought my tank seams were leaking but it was hard to tell. I probably leaked a good cup or two of gas on the ground. After I got home I started searching the forums for clues which lead me to believe the sending unit might be leaking. Tomorrow I'll crawl up under the tank and take a closer look so I should have a better idea where the fuel is coming from.