My debit card was at the bottom end, very small amount left; I did the puter transfer to the card, went to shop. Bought gas, fine, it worked well. Went to the second place and made a small purchase attempt, card would not go through. It seems that the gasoline sellers (when you use the card at the pump), place a hold on the account, apparently they do not know how much fuel you are going to buy so they place a hold on a large sum of money until it registers that you buy a smaller portion of their antisipated charges. This was my LAST fuel purchase at SHELL OIL.