Flight and Fuel Selector Repositioning
After departing with full fuel tanks, the pilot reported that approximately one hour into the flight, he repositioned the fuel selector from the right tank to the left tank. The flight continued normally and entered the traffic pattern for landing.
Engine Failure During Approach
The pilot extended the downwind leg due to other traffic. After turning onto the left base leg, the engine failed to respond to throttle input. The airplane subsequently collided with trees during the forced landing.
Post-Accident Examination
The airplane was recovered and both fuel tanks were found to be ruptured. The fuel selector was positioned to the right fuel tank. The fuel line to the carburetor inlet and the carburetor bowl were drained, each containing about 1 to 2 ounces of fuel. No fuel contamination or obstructions in the fuel supply system were noted.
Engine Test
An undamaged propeller was installed, along with an auxiliary fuel tank. The engine was started and found to operate normally, indicating no pre-existing mechanical issues.