What was found
AFTER DEPARTURE TOWER REPORTED MIST COMING FROM RIGHT WING AS WE WERE RETURNING STARTED HAVING A FUEL IMBALANCE DECLARED AN EMERGENCY RETURNED TO YAM ON FINALE TOWER REPORTED POSSIBLE STILL TRAILING FUEL, AFTER LANDING FIRE DEPARTMENT DID SEE FUEL LEAKING BUT NOT MUCH UNTIL TAXI IN AND MAKING LEFT TURNS FUEL THEN RAIN OUT OF WING BOTTOM. AIRCRAFT REMOVED FROM SERVICE. REMOVED AND INSTALLED NEW O-RINGS ON WIGGINS COUPLELING VENT LINES (WS65.045-WS148.019) IAW AMM 20-30-00-910-802, REV 66. NO LEAKS NOTED.