The pilot stated that he began the day with an unknown quantity of fuel. Shortly after departing on his second flight of the day, the airplane suffered a complete loss of engine power. During the subsequent forced landing, the left main landing gear caught tall grass and ground-looped the airplane, which resulted in substantial damage to the left landing gear, left wing strut, and left lower fuselage. Post accident examination of the wreckage by a Federal Aviation Administration (FAA) inspector revealed no odor of fuel, no fuel spillage, and 5 ounces of fuel in the airplane. The pilot reported that there were no mechanical deficiencies with the airplane.