What was found
REMOVED AND REPLACED THE TAILTANK FUEL PUMP AFTER THE CIRCUIT BREAKER POPPED WHILE DOING A FUEL TRANSFER FUNCTIONAL CHECK. UPON TRYING THE FUNCTIONAL CHECK AGAIN, IT WAS FOUND THAT THE PUMP RAN CONTINUOUSLY IN THE ARM POSITION. ARCING WAS FOUND ON THE POSITIVE TERMINAL OF THE PUMP THAT WAS REMOVED. IT WAS FOUND THAT THE LOW LEVEL FLOAT SWITCH WAS NOT SHUTTING THE PUMP OFF. NEED TO IMPROVE SHUT OFF SWITCH OR ADD BACK UP SYSTEM TO PREVENT THE PUMP FROM RUNNING WITH THE TANK EMPTY.