Preflight and Departure
The pilot flew to an airport and had the airplane completely refueled for the return flight. However, prior to departure, he decided to drive home due to weather. The airplane remained parked outside for approximately 10 days before the pilot returned.
Upon return, the pilot conducted a preflight inspection, including draining all four fuel tank sumps. No contaminants were identified in the fuel. The engine was started, runup checks were completed, and the airplane departed.
Loss of Engine Power
Approximately 20 to 25 minutes after departure, while cruising at 7,500 feet mean sea level, the engine lost all power. The pilot attempted to restore power by switching fuel tanks and selecting each magneto independently, but these actions were unsuccessful.
Forced Landing
The pilot initiated a forced landing toward an airport. However, the airplane struck trees short of the runway and came to rest.
Post-Accident Examination
An examination of the engine revealed no mechanical deficiencies. However, inspection of the airframe showed that all four fuel cap seals had varying degrees of deterioration, and the left main fuel cap was loose. Examination of the fuel system found approximately 1/4 cup of water in the main fuel strainer and only a trace of fuel between the strainer and the individual cylinders.