What was found
(CAN) PILOT REPORTS THAT AFTER TAKEOFF, APPROXIMATELY 1200 AGL DURING CLEAN UP OF THE FLIGHT DECK CONFIGURATION THE NR 2 ENGINE FUEL AUXILIARY PUMP WAS SELECTED OFF. APPROXIMATELY 5 TO 10 SECONDS AFTER THE PUMP WAS SELECTED OFF THE ENGINE BEGAN TO SURGE WITH AN ASSOCIATED FUEL PRESSURE MASTER CAUTION LIGHT AND THEN THE ENGINE FAILED. PILOT RETURNED TO BASE. MAINTENANCE FOUND A PROTECTIVE CAP INSIDE A FLEX LINE GOING TO FMU. MFG IS INVESTIGATING THIS EVENT VIA QUALITY INVESTIGATION REQUEST NR DDOU-QIR-11-00020.