CRJ-900 AT 8000 FT WAS NOTIFIED BY FLT ATTENDANT OF FUEL LEAK ON RIGHT WING; FLT CREW RETURNED TO DEP ARPT REQUESTING CFR EQUIP; FUEL CAP WAS NOT SECURED.

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ON INITIAL CLBOUT AT AROUND 8000 FT; WE WERE NOTIFIED BY THE AFT FLT ATTENDANT THAT THERE WAS FUEL LEAKING FROM THE R WING. WE THEN ADVISED ATC THAT WE NEEDED TO RETURN TO ZZZ AND TO HAVE CFR AVAILABLE. WE REALIZED WE WOULD BE OVER OUR MAX LNDG WT; BUT MADE THE DECISION NOT TO DELAY THE RETURN. WE LANDED WITHOUT INCIDENT AND TAXIED OFF THE RWY. WE THEN TALKED TO CFR ON THE GND AND ASKED FOR A VISUAL THAT THERE WAS NO FIRE PRESENT AND WHAT AMOUNT OF FUEL WAS LEAKING FROM THE WING. THEY VERIFIED NO SMOKE OR FIRE AND THAT A SMALL AMOUNT OF RESIDUAL FUEL WAS DRIPPING FROM THE R WING TRAILING EDGE. THEY THEN CLRED US TO THE GATE AND WE DEPLANED THE PAX NORMALLY. THE INCIDENT OCCURRED BECAUSE THE R OVERWING FUEL CAP WAS NOT SECURED PROPERLY. AFTER WE LANDED; I INSPECTED THE FUEL CAP AND THE LEADING EDGE OF THE CAP WAS SKEWED APPROX 1/8 INCH UP; ALLOW THE FUEL TO ESCAPE. FUELERS SHOULD BE MADE AWARE OF THE IMPORTANCE OF THE OVER-THE-WING FUEL CAP TO BE ABSOLUTELY FLUSH WITH THE WING SURFACE AFTER FUELING. AFTER THE INCIDENT OCCURRED; THE FUELER OPENED AND CLOSED THE FUEL CAP SEVERAL TIMES AND COULD NOT REPEAT THE SKEWED POS OF THE FUEL CAP.