What was found
(CAN) DURING PREACCEPTANCE GROUND RIGGING PROCEDURE, THE INSTALLER PERFORMED THE INITIAL RUNS AND PERFORMED THE RIGGING CHECKS WITHOUT ANY SIGNS OF A PROBLEM. THEY RAN THE ENGINE SEVERAL TIMES, INCLUDING MAX POWER AND BOOST PUMP OPERATION. AFTER THE ACFT WAS IN THE HANGAR OVERNIGHT, THEY NOTICED A PUDDLE OF FUEL ON THE FLOOR AND DISCOVERED THE SOURCE TO BE THE FCU. THERE WERE NO PERFORMANCE ISSUES DURING THE ENGINE RUNS.