What was found
DURING TAKEOFF, THE ENGINE MOMENTARILY LOST POWER WHEN FUEL BOOST PUMP WAS SHUT OFF. FUEL FLOW REDUCED BY 8 GPH. AFTER A COUPLE OF SECONDS, THE FUEL FLOW RETURNED TO NORMAL AND THE ENGINE RECOVERED POWER. THE AIRCRAFT LANDED WITHOUT INCIDENT. GROUND TESTING REVEALED THE ENGINE DRIVEN PUMP WAS SUPPLYING PROPER PRESSURE DURING ALL OPERATIONS EXCEPT FOR FULL POWER AFTER ELECTRIC PUMP SHUT DOWN. INTERUPTION OF FUEL FLOW WAS ONLY MOMENTARY AND DID NOT OCCUR AT LOWER POWER SETTINGS. ENGINE DRIVEN PUMP WAS REPLACED AND ENGINE OPERATES NORMALLY. (X)