Accident Summary
The pilot reported to air traffic control that the airplane was low on fuel and the engine was sputtering. Witnesses observed the airplane strike terrain and nose over adjacent to an Interstate highway.
Post-Accident Inspection
During recovery of the airplane, an FAA inspector noted that water appeared to drain from the left fuel tank. Subsequent examination revealed that the airplane's fuel system was not compromised, and about 9 gallons of fuel was drained from the airplane. Water was found throughout the fuel system. The carburetor contained approximately 3 ounces of water.
Fuel Cap Condition
Examination of the right fuel cap revealed the cap was unsecured and unserviceable. The cap was removed and rust was observed around the inside of the fuel port. The pilot/owner had previously declined a repair to the cap due to cost. According to the fixed base operator from where the airplane departed, "It was a terrible looking airplane. There was excessive fuel staining down the right side. The cap had no O-ring or gasket and we've had a lot of rain. He didn't want the work. The only work we did was to service his oxygen tank." Between the times the repair was declined and the pilot departed on the accident flight, approximately 14 inches of rain fell on the airplane.
Engine and Maintenance
Examination of the airplane's engine revealed no mechanical deficiencies. The airplane's most recent annual inspection was performed 13 months prior to the accident. The pilot's most recent medical certificate was issued 4 years prior to the accident and his most recent biennial flight review was completed 3 years prior to the accident.