What was found
JANUARY 2, 1999, AT APX 16:30 HOURS, WHILE ON A ROUTINE SIGHTSEEING FLIGHT, PILOT EXPERIENCED A FUEL FILTER CAUTION LIGHT. COLLECTIVE MOVEMENTS CREATED FLUCTUATIONS IN FUEL PRESSURE AND NO ROTOR RPM DROOP. PILOT LANDED AT BEST SITE AVAILABLE AT MAUNA KEA RESORT HELIPAD WITHIN TEN MINUTES OF LIGHT ILLUMINATION. INSPECTION OF ACFT TANK SUMP - FUEL WAS FOUND CLEAN. FUEL AT THE AIRFRAME FUEL FILTER WAS DARK IN COLORING. PROBLEM CONFIRMED TO BE FROM ELECTRIC BOOST PUMP. REPLACED FUEL BOOST PUMP AND FUEL CONTROL REGULATOR. SUBMITTER STATED POSSIBLE INTERNAL SEAL LEAKAGE AND BRUSH MATERIAL FLUSHED INTO SYSTEM AND RECOMMENDED THAT AIRBORNE EVALUATE PUMP SEALS.