What happened
During the initial takeoff roll, the aircraft experienced a loss of engine power, prompting the pilot to abort the takeoff. The pilot taxied back to perform engine run-ups; the left engine was run up three times until audible puffing or popping noises ceased, after which a second takeoff attempt was commenced.
Witnesses observed one or more engines sputtering during the initial climb. The pilot reported that the left engine lost power within 300 feet of ground level. In an attempt to return to the airport, the pilot executed a steep left bank, subsequently losing control and colliding with the ground. There were no fatalities reported in this accident.
The investigation
Investigators examined the engine and carburetor assemblies. The left engine and its carburetor assembly were successfully test-run following the accident. Analysis of the fuel revealed that clear, blue-colored fuel was present in the left engine's carburetor, the gascolator, and the right main fuel tank.
However, cloudy, green-colored fuel containing sediment was discovered in the right engine's carburetor, as well as in both the driven and auxiliary fuel pumps of the right engine. Additionally, a foreign substance, which laboratory testing identified as polystyrene, was found adhered to the inside of the right engine's venturi.