WHEN TRYING TO PUT FUEL INTO THE VEHICLE WITH THE IGNITION RUNNING, THE VEHICLE SHIFTED FROM PARK INTO REVERSE AND ROLLED BACKWARDS. THE VEHICLE WAS IN FOUR WHEEL DRIVE AT THE TIME. THE DRIVER'S SIDE DOOR WAS OPENED AND THE TRUCK KNOCKED DOWN THE DRIVER, AND THE DOOR CAUGHT ON THE FUELING PUMP, BREAKING THE DRIVER'S SIDE DOOR. THE VEHICLE STOPPED UPON HITTING ANOTHER VEHICLE. *AK