What was found
CUSTOMER REPORTED ENG DRIVEN FUEL PUMP FAILED AT 600 FEET AGL AFTER T/O. PILOT ACTIVATED ELEC PUMP AND SAFELY LANDED AIRPLANE. PUMP SENT TO THIS FACILITY FOR DISASSEMBLY AND INSP. WHEN PUMP DISASSEMBLED, 2 SMALL FLAKES OF ALUM FOUND JAMMED IN VANES OF PUMP. THIS CAUSED PUMP TO SEIZE AND DRIVE COUPLING TO SHEAR. VAPOR SEPARATOR OF PUMP FND TO BE SOURCE OF ALUM. A SHARP MACHINED EDGE INSIDE HOUSING OF SEPARATOR HAD LOST MATERIAL INTO VANES OF PUMP. CASTING OF VAPOR SEPARATOR MAY HAVE BEEN POOR QUALITY THAT ALLOWED THIS TO HAPPEN. A POSSIBLE MEASURE TO PREVENT THIS SITUATION FROM OCCURRING WOULD BE TO ROUND THE SHARP EDGE IN VAPOR SEPARATOR DURING OVERHAUL.