What happened
During a cross-country flight, the right engine of the aircraft began running roughly. In response, the pilot feathered the propeller and diverted toward an airport to land. While en route, the left engine also began to run roughly.
Because the pilot was unable to reach the intended airport, a forced landing was executed on a road. During the landing roll, the aircraft struck an abandoned car and collided with the terrain. The occupants were not injured.
The investigation
An inspection of the engines revealed that the fuel lines for both engines were partially blocked by an unknown substance.
The pilot reported that in the months preceding the accident, the left engine had experienced power loss on at least four to five occasions. Following each of those previous occurrences, a mechanic had inspected the engine. The issues identified during those prior inspections ranged from a clogged oil separator to low fuel pressure, which had been addressed by replacing various hoses.