Background
Prior to a flight from the Bahamas to West Palm Beach, Florida, the pilot observed a problem with the quick-drain valve for the left fuel tank. After landing at West Palm Beach, fuel was added only to the right tank because the pilot anticipated replacing the left quick-drain.
Event
On the subsequent flight to Vero Beach, Florida, the pilot was using fuel from the left tank when the engine hesitated. The left fuel gauge indicated less than a quarter full. The pilot checked the magnetos and found the left magneto to be rough. While comparing the magnetos and contacting Vero Beach tower, the engine power fell to idle at an altitude of approximately 1,000 feet.
Believing the issue was a magneto problem, the pilot continued switching magnetos and delayed switching the fuel selector. Subsequently, he performed a forced landing on a sandy area. During the landing, the right main landing gear folded, and the right elevator sustained damage.
Investigation Findings
Examination after the incident revealed only a few ounces of fuel remaining in the left tank, while a considerable amount of fuel was still present in the right tank. Additionally, water and dirt were found in the right tank, and approximately one ounce of water was discovered in the fuel lines.