ACR B757-200 DIVERTS TO ENRTE ARPT AFTER ENG SHUT DOWN BECAUSE OF FUEL LEAK DISCOVERED BY A PAX.

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APPROX 30 MINS AFTER DEPARTING MHT FOR ORD; WE WERE AT CRUISE; FL350; .80 MACH. FLT ATTENDANT ADVISED US THAT A PAX NOTICED THE L WING WAS 'LEAKING.' I LEFT THE COCKPIT TO DO A VISUAL INSPECTION OF THE L WING. IT APPEARED TO ME THAT THE L WING WAS LEAKING SIGNIFICANTLY; IN THE VICINITY OF THE INBOARD-MOST FLT SPOILER AND BEHIND (AFT OF) THE L NACELLE. BECAUSE WE HAD BEEN DELAYED OUT OF MHT TO FIX A L ENG FUEL LEAK; AND MY VISUAL INSPECTION INDICATED A PROBABLY FUEL LEAK; WE CONTACTED MAINT VIA ACARS. MAINT ALSO SUSPECTED A FUEL LEAK BASED ON OUR DESCRIPTION OF THE SIT. THE CAPT AND I ACCOMPLISHED THE CHKLIST FOR INFLT FUEL LEAK; WHICH DIRECTS THE CREW TO SHUT DOWN THE AFFECTED ENG. THE CAPT SELECTED SYR AS THE NEAREST; SUITABLE AIRFIELD; AND ACCOMPLISHED A SINGLE-ENG LNDG AT SYR. AN EMER WAS DECLARED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: CALLBACK REVEALED THAT THIS WAS A B757 THAT HAD BEEN WORKED ON AT AN OUTLYING STATION BY CONTRACTED MAINT FOR A FUEL LEAK ON THE ENG INVOLVED. THE PROB DISCOVERED AT THAT POINT WAS A LOOSE FITTING ON A FUEL LINE IN THE ENG COMPARTMENT ABOVE THE OIL FILLER ACCESS DOOR. THE PAX WHO CALLED THE LEAK TO THE CREW'S ATTN RPTED THAT THE LEAK STOPPED WHEN THE ENG WAS SHUT DOWN.