A method and system for preventing fuel theft includes one or more tamper detection sensors mounted on a fuel dispenser, the tamper detection sensors being operable to detect dislocation of one or more portions of the fuel dispenser's shell. A dispenser security controller is communicatively coupled to the one or more tamper detection sensors and is operable to generate a trigger signal in response to receiving a tamper detection signal from the one or more tamper detection sensors. A dispenser transaction-termination switch is electrically coupled to the fuel dispensing circuit and in signal communication with the dispenser security controller and is operable to simulate a fuel pump handle hang up and/or a transaction not-authorized condition in response to a trigger signal from the dispenser security controller.