What was found
ON CLIMB OUT, AT 1500 FEET, CREW REPORTED BOTH ELECTRONIC ENG FUEL FLOW INDICATORS DROPPED OFF TO 20 POUNDS PER HOUR, NORMAL CLIMB FUEL IS 180 TO 210 POUNDS PER HOUR, ALL OTHER ENG INDICATIONS NORMAL. EMERGENCY DECLARED, RETURNED TO BLOCK, WITH 600 LBS OF FUEL ON BOARD. LANDING WAS UNEVENTFUL. MX REMOVED AND REPLACED LT ALTERNATOR NOISE FILTER CAPACITOR. GROUND CHECKS OK. ACFT RELEASED BACK TO SERVICE.