AN A319 FLT CREW DIVERTED TO DEN AFTER BEING NOTIFIED THAT A PAX NOTICED A FUEL LEAK DURING A FLT TO ORD.

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PAX NOTIFIED CREW THAT THEY OBSERVED A LEAK FROM THE R WING AREA. FO AND CAPT MADE A VISUAL INSPECTION OF THE LEAK AND MADE THE DECISION TO RUN THE FUEL LEAK CHKLIST. IN THE PROCESS WE ADVISED DISPATCH AND MAINT AND MADE A DECISION TO DIVERT TO DEN. THE ONBOARD INDICATIONS DID NOT REFLECT A LOWER THAN NORMAL FUEL SCORE. THE SYNOPTIC DISPLAY PAGES DISPLAYED NORMAL FUEL VALUES AND THERE WERE NO INDICATIONS THAT DEMONSTRATED THAT WE WERE EXPERIENCING A SIGNIFICANT FUEL LEAK. WE MADE A DECISION TO DIVERT TO DEN AFTER SENDING COMPANY DISPATCH A MESSAGE AND WE MADE AN UNEVENTFUL LNDG IN DEN. THE DEN ARPT HAD A FIRE VEHICLE APCH THE ACFT AFTER WE STOPPED ON THE TXWY. THE INSPECTION REVEALED NO FUEL LEAK. MAINT FOUND A DEFECT WITH THE TOP R WING FUEL CAP AND IT WAS REPLACED. WE CONTINUED ONTO THE FINAL DEST. THE FUEL CAP WORKED WELL ON THE SUBSEQUENT LEG. BOTH DISPATCH AND MAINT PROVED TO BE A USEFUL RESOURCE AND THE ZDV FACILITY GAVE US EXCELLENT HANDLING AS WE MADE THE DECISION TO CHANGE THE DEST TO DEN.