A B777 IN CRUISE AT FL370 DECLARED AN EMER AND DIVERTED DUE TO AN INTERMITTENT FUEL SMELL AT DOOR 2R.

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ENRTE TO LHR; PURSER RPTED INTERMITTENT SMELL OF KEROSENE AT DOOR 2R. SEVERAL FLT ATTENDANTS CONFIRMED SMELL AND COMPLAINED OF EYES BURNING. I WAS ON MY CREW BREAK AND WAS WOKEN UP AND TOLD TO GO TO COCKPIT. CAPT ASKED ME TO INSPECT THE SIT. SMELL WAS INTERMITTENT AT DOOR 2R. I ASKED SEVERAL FLT ATTENDANTS TO SMELL THE AREA AND ALL COULD SMELL KEROSENE INTERMITTENTLY. CAPT WAS INFORMED OF SIT. CAPT WENT BACK TO DOOR 2R AND CONFIRMED A SMELL AT DOOR 2L&R. CAPT HAD FLT ATTENDANTS INSPECT OVERHEAD BINS AND UNDER PAX SEATS FOR SPILLAGE. CREW CONTACTED DISPATCH AND MAINT THAT ODOR GOT STRONGER. WE DUMPED FUEL DOWN TO MAX LNDG WT AND DIVERTED TO GANDER YQX. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THAT WHEN HE CHKED THE AREA THE SMELL WAS PRESENT MOMENTARILY AND THEN WAS GONE. THE RPTR SAID THE FUEL SMELL CAME AND WENT IN INTERMITTENT PUFFS. THE RPTR SAID AT FIRST THE SOURCE WAS THOUGHT TO BE THE GARBAGE BAGS BUT WAS PROVED WRONG. THE RPTR SAID AFTER LNDG IN GANDER THE AIRPLANE WENT OTS AND THE CORRECTIVE MAINT ACTION IS UNKNOWN.