Engine Failure
Approximately 70 minutes after departure on a cross-country flight, the engine ceased operation. The pilot noticed that the left fuel tank gauge indicated empty, then switched the fuel selector to the right tank, successfully restarting the engine and continuing toward the destination.
Approximately 90 minutes later, while on final approach for landing, the engine stopped again. The pilot executed a forced landing.
Post-Accident Examination
Inspection of the aircraft revealed the right wing fuel tank was empty. The left wing tank contained approximately nine gallons of fuel. Fuel tank structural integrity was not compromised, and no fuel stains were observed around the engine compartment or on the belly skin.
Fuel System Findings
The fuel selector valve was found in the right tank position. The fuel return line fitting had separated from the engine firewall. Examination of the threads on both the male and female connection points showed deformations.
Pilot's Report
The pilot reported that prior to departure the aircraft had been serviced with 84 gallons of fuel. Based on a fuel burn rate of 14.5 to 15.5 gallons per hour, the pilot estimated that approximately 37 gallons should have remained upon reaching the destination, which was 348 nautical miles from the departure point. No fuel odors were noticed during the flight.