What was found
DURING TAXI, RECEIVED AN AMBER CAS WING TANK OVER FULL RT. WASN'T ABLE TO STOP THE FUEL FROM DUMPING FROM OVERFLOW UNTIL PULLING THE EXTERNAL CENTER TANK TEE HANDLE. AIRCRAFT WAS FUELED TO 7000LBS. PERFORMED INSPECTIONS AND OPS CHECKS OF RT SURGE TANK FLOAT VALVE. NO FAULTS NOTED. PERFORMED ELECTRICAL CHECKOUT OF RT FUEL TRANSFER VALVE, NO FAULTS NOTED. SET GRAVITY CROSSFLOW SWITCH TO OFF POSITION. PERFORMED OPS CHECK OF GRAVITY TRANSFER SWITCH AND FUEL TRANSFER SYSTEM SATISFACTORY IAW AMM 12-12-10, 28-10-04, 28-20-00, AND 28-21-00.