At about 1211 Eastern daylight time, the airplane was substantially damaged during a forced landing. The private pilot and passenger were not injured. Visual conditions prevailed. According to the pilot, he verified before takeoff there was sufficient fuel aboard for the flight. While on final approach to the destination and at about 300 to 400 feet agl, the airplane "experienced some sink." He attempted to add power but the engine did not respond. He verified four gallons of fuel were in the right tank, and the boost pump was ON, but the engine did not restart. Unable to make the runway, he performed a forced landing in a field, during which the right wing clipped a tree. The airplane was substantially damaged at about 1040 Mountain time during a forced landing. The solo pilot was uninjured. Visual conditions prevailed. Before takeoff, the pilot added 24 gallons of mogas, sumped the fuel tanks and observed no contamination or water. About 30 minutes after departure and while cruising at about 10,500 feet msl, he observed fuel pressure decrease from 44 psi to 39 psi. It increased to 40 psi, before decreasing to zero as the engine stopped producing power. For the next few minutes, fuel pressure and engine rpm fluctuated between normal and zero. Activating the backup fuel pump had no effect.
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