PA28 PLT MAKES OFF-ARPT LNDG WHEN ENG LOSES PWR IN ZNY AIRSPACE.

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FUELED ACFT AT CXY; CHKED TANKS DURING PREFLT; HAD 74 GALS. FILED IFR FLT PLAN CXY TO FOK; 7000 FT. APPROX 1 HR OUT OF CXY; SWITCHED MAIN FUEL TANKS FROM L TO R. EXPERIENCED LOSS OF PWR; PERFORMED EMER CHK; CALLED ATC; GAVE ME HEADINGS TO N31. BROKE OUT AT 3000 FT. ATC INFORMED ME I WAS OVER THE ARPT. I DID NOT HAVE ENOUGH TIME FOR ANOTHER 360 DEGS. KNOWING MY CHEROKEE 6-260 HAS A GLIDE RADIO OF 1.5 MI PER 1000 FT; I CHOSE A FIELD AND LANDED SAFELY. I IMMEDIATELY NOTIFIED FLT SVC. THERE WAS NO DAMAGE TO ACFT. NO INJURIES TO PLT. ATC IS CREDITED IN ASSISTING MY SAFE LNDG. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: PLT STATES THAT THE ENG WOULD NOT DEVELOP MORE THAN IDLE PWR. HE CANCELED HIS IFR FLT PLAN AND ASKED FOR VECTORS TO THE NEAREST ARPT. HE DID NOT DECLARE AN EMER. PLT STATES THAT HE DID NOT SEE THE FIELD; AND ELECTED TO CONTINUE STRAIGHT AHEAD TO AN OFF-ARPT LNDG. SUBSEQUENT INSPECTION REVEALED WATER IN THE FUEL. PLT STATES THAT HE HAD JUST ADDED FUEL PRIOR TO THIS FLT; HAD CHKED THE SUMPS FOR THE PRESENCE OF WATER; AND FOUND NONE.