What was found
(CAN) FUEL WAS VERY SLOW TO DRAIN FROM AUXILIARY TANK TO MAIN TANK AND SELECTOR VALVE. THE AUXILIARY TANK VENT LINE WAS FOUND KINKED OVER THUS BLOCKING ANY AIR FLOW INTO TANK. THE SUSPECTED CAUSE OF THIS CONDITION WAS THE ROTOR BRAKE ENGAGEMENT CHAIN WHICH APPEARS TO HAVE CAUGHT ON THE LOCK WIRE ATTACHING THE FLEXIBLE VENT TUBE TO THE SOLID VENT FLANGE ON THE TANK. WHEN THE ROTOR BRAKE WAS ENGAGED THE TUBE WAS PULLED INTO THE KINKED POSITION.