Accident Summary
The pilot reported that the engine began to lose power at 300 feet above the ground after takeoff. A forced landing was attempted on a highway, during which the aircraft struck a guard rail.
Investigation Findings
The Federal Aviation Administration (FAA) was able to run the engine after the accident. An inspection of the fuel line revealed the presence of air bubbles.
Fuel System Issues
A Cessna service letter had not been complied with that recommended modifications to the fuel system to prevent vapor lock problems. Additionally, the pilot was not familiar with fuel system vapor lock.
Conclusion
The investigation did not specify a probable cause, but the findings indicate two related issues: non-compliance with the service letter and the pilot's lack of familiarity with vapor lock phenomena.