I consider myself the foremost authority on leaks with this car....I have fixed fuel leaks, coolant leaks, brake fluid leaks and freon leaks......The answer to your question is that I need more info....If it only happens when you fill up that is one thing, if it happens when you are back home or driving it is another...I am guessing that you are overflowing at the main gas hose that leads into the tank....I never over fill the car and often because of the angle of the hose the pump cuts off 5 times while I am pumping gas..... Inside the bonnet remove both panels and look for the leak.... If you do this at the gas station away from the pumps it will be open and ventilated....do you smell gas when you are driving??? looking under the car can be misleading because the leak may be traveling down the frame.....I live in MD, not far from you.....let us know what you find. The most important thing is to find out what it is now. Do not mess around when it comes to gas. Mike C 2109