What was found
FLT 6328 - RDU TO MCO - AFTER TAKEOFF FROM RDU ON CLIMB-OUT, PAX NOTICED FUEL LEAKING FROM RT WING AROUND AILERON AREA. FLT ATTENDANT NOTIFIED OF LEAK & THEN PROCEEDED TO NOTIFY FLT CREW. TANK 2 INDICATION SHOWED A FUEL USAGE OF APPROX 300 LBS MORE THAN TANK 1 AFTER REACHING 8,000 FT ON CLIMB OUT FROM RDU. FUEL QTY ON MFD TANK 2 INDICATION NOTICED DECREASING AT AN IRREGULARLY FAST RATE, APPROX 10 LBS EVERY 5 SECONDS. DECISION MADE OUT OF SAFETY OF FLT TO RETURN TO RDU DUE TO FUEL LEAKAGE. AN EMERGENCY DECLARED & A NORMAL LANDING EXECUTED. AIRCRAFT WAS REFUELED AND OPERATION OF VENT VALVE VERIFIED AS OPERATING PROPERLY. INSPECTED ALL RT FUEL ACCESS PANELS AND RIGHT REAR SPAR WITH NO LEAKS NOTED.