[PennBF]

I have a question regarding filling up a gas tank and hope someone can explain the reason for the problem. I stopped at WaWa on 301/466 to fill up my gas tank. I was using a Gas Card. I placed the hose into the car and proceeded to fill the car up. The card usage continued to show the amount as it rang up the sale. As the card appeared to be reaching "full" it locked up the hose and completely shut down to the point you could not even try to add another once of gas. I drove away thinking I had filled the tank which should have meant I had about 400 miles to go. At about 100 miles which I already had in the tank when I first drove in the indicator on the dash board showed I had 70 miles left and I just made it to another gas station and filled it up again and it is fine now. My first guess is that while I was pumping the gas the gas station tank was empty and pumping air and running up the costs? The car was in the garage before I used it next so no one could have taken gas out! I went back to WaWa a few days later to see if they could shed some light on the reason and they could have cared less. I got a "that's interesting" ! Does anyone have any ideas how something like this can happen? Please no smart a%$ responses?