What happened
The aircraft was flying along its planned route when the fuel pressure suddenly dropped. Shortly after this drop, the left engine lost all power completely. Unable to maintain altitude or continue the flight, the pilot executed an emergency landing in a nearby corn field. The impact caused significant damage to the airframe.
The investigation
A thorough examination of the aircraft revealed that the fuel line had separated at the flow divider. This separation was the direct cause of the loss of fuel pressure and subsequent engine failure. Further inquiry indicated that the engine had been recently installed by the pilot-mechanic himself. The investigation found that the fuel line had not been properly torqued during this installation, which allowed it to loosen and separate during flight.
Findings
The primary factor in this accident was the improper installation of the engine by the pilot-mechanic. Specifically, the failure to properly torque the fuel line at the flow divider led to its separation. This mechanical failure resulted in a complete loss of power in the left engine and a forced landing off-airport.