What was found
PILOT REPORTED ENGINE SURGING ON TAKEOFF WITH SIGNIFICANT FUEL FLOW FLUCTUATION WHICH WAS CORRECTED WITH A DECREASE IN ENGINE POWER BY ADJUSTMENT OF THE PROP CONTROL AND ACTIVATION OF THE STANDBY ELECTRIC FUEL PUMP. POST-GROUND RUNS COULD NOT DUPLICATE THE PROBLEM. FOLLOW-UP TEST FLIGHT COULD NOT DUPLICATE THE PROBLEM. INSPECTION OF THE AIRCRAFT FUEL SYSTEM DID NOT FIND ANY CONTAMINATION, OBSTRUCTIONS, OR LEAKAGE. (X)