1993 Ford Station Wagon

1993 Ford Station Wagon 6 cyl Front Wheel Drive Automatic 250000 miles

I have a problem with my fuel line I think. Ive took the car to the inspection station and failed. They told me that I have a fuel leak or there is air in my fuel lime. I can not visually see the leak but I know there is one, everytime I fill up the tank the gas goes as fast as if I only put in a half a tank. Can anyone tell me how to fix this problem.
June 23, 2010.

Are you able to smell the fuel? If so, where is it the strongest?