Flight and Maintenance Context
A pilot and a mechanic were conducting a test flight following maintenance that included replacement of the magnetos, spark plugs, and ignition harness. During the flight, the engine began running roughly. The roughness ceased after the boost pump was activated.
Smoke and Power Loss
Shortly thereafter, the cabin filled with smoke. The master switch was turned off, and around the same time, the engine lost power. The smoke was cleared from the cockpit by opening a side window and the cabin door.
Forced Landing Attempt
The pilot attempted to glide the aircraft to an abandoned military strip. However, the altitude was insufficient to reach the field. During touchdown, the airplane struck a chain link fence at the approach end of the field.
Post-Impact Fire
The pilot reported that a fuel leak occurred following the impact, and the leaking fuel was ignited by the hot exhaust system.