A system and method are described that can help gas stations detect attempted thefts of gas or when there is leakage from a fuel tank or pump. The fuel pump can comprise a payment processing system or is fuel sensor to detect the amount of fuel pumped. The large fuel tank that supplies the fuel pumps can comprise a fuel level sensor to detect how much fuel is being used. The fuel pumps and tanks can send their data to the kiosk or some other location for analysis. If more fuel is being lost from the fuel tank than is being paid for at the pumps, then a theft may be occurring, or there may be fault machinery or leaks.