Accident Overview
The airplane experienced an in-flight loss of engine power approximately one hour into the flight. The pilot applied carburetor heat and activated the auxiliary fuel pump, but engine power was not restored. He then switched the fuel selector from the left main tank to the left auxiliary tank and waited for one minute, followed by switching to the right auxiliary tank, all without restoration of power. The pilot attempted to use the primer to deliver fuel to the engine.
Forced Landing
Unable to restore engine power, the pilot committed to an off-field landing in an alfalfa field. After clearing power lines, the pilot extended full flaps and chose not to extend the landing gear. The airplane touched down with the gear retracted.
Post-Accident Inspection
Federal Aviation Administration inspectors examined the airplane at the accident site. Both main fuel tanks were completely dry, while both auxiliary fuel tanks were full. When an inspector placed the fuel selector on an auxiliary tank position and activated the boost pump, the fuel system pressurized and operated normally after several seconds. No mechanical defects were found in the fuel system or the airplane.
Conclusion
The loss of engine power resulted from fuel starvation, as the main tanks were empty and the auxiliary tanks contained fuel. The airplane's fuel system functioned correctly when tested with fuel from the auxiliary tanks.