What was found
DURING PATIENT TRANSPORT THE "FUEL FILTER" CAUTION LIGHT ILLUMINATED INSIDE CLASS D. THE PILOT ANNOUNCED TO THE MED CREW THAT HE HAD A POTENTIALLY CRITICAL SITUATION AND WAS IMMEDIATELY EXECUTING A PRECAUTIONARY LANDING. DECLARED AN EMERGENCY WITH TOWER. FLEW 1 MINUTE TO APPROACH END OF 21 AND ENTERED POWER ON AUTO ROTATION. NO NG OR ENGINE FLUCTUATIONS DETECTED. TERMINATED WITH POWER TO A HOVER. HOVER TAXIED TO CLOSEST RAMP AND SHUT DOWN. THE MECHANIC ARRIVED AND FOUND THE FUEL FILTER FAULTY. REPLACED THE FILTER AND RETURNED THE AIRCRAFT BACK TO SERVICE.