On July 23, 1999, at 1100 eastern daylight time, a Beech 77, N38482, flipped inverted in a field during an attempted forced landing eight miles North of Dawson Airport, in Dawson, Georgia. The airplane was operated by the pilot under the provisions of Title 14 Part 91, and visual flight rules. Visual meteorological conditions prevailed, and no flight plan was filed for the business flight. The pilot was not injured and the airplane sustained substantial damage. The flight departed Dekalb-Peachtree Airport, in Atlanta, Georgia, at 0945. Approximately one hour and forty-five minutes into flight, the pilot initiated an enroute descent from 4500 feet to 2500 feet. The pilot stated that during the descent the engine lost power. Several attempts by the pilot to restart engine power failed. The pilot selected an open field for an emergency landing. The airplane flipped over following the touchdown. Examination of the airplane disclosed that approximately 13 gallons of fuel were recovered from the right fuel tank. No fuel was recovered from the left fuel tank. According to the Pilot Operating Handbook (POH) and Flight Manual, the fuel selector has only two positions, on and off. The POH also showed that the fuel system has two in-line check valves to prevent fuel movement between tanks. According to the operator, he had experience check valve failure on several occasions in other Beech 77 type airplanes. Both check valves were removed from the fuel system. Examination of the right check valve disclosed that it was blocked.