On July 10, 2014, about 1150 eastern daylight time, a Beechcraft C24R, N6222Q, was substantially damaged during a forced landing near Titusville, Florida. The commercial pilot and the passenger received minor injuries. Visual meteorological conditions prevailed and no flight plan was filed for the local flight that departed Space Coast Regional Airport (TIX), Titusville, Florida at 1042. The personal flight was conducted under the provisions of Title 14 Code of Federal Regulations Part 91. According to written statements by the pilot and passenger, the purpose of the flight was to test some recently serviced avionics and the auto pilot system. After an uneventful departure, the pilot changed the fuel selector from the left tank to the right tank and flew north along the coast for about 30 minutes. The pilot then made a 180-degree turn to the south and switched the fuel selector to the left tank. About that time, the pilot momentarily detected an odor of fuel. His passenger did not smell any fuel, and the pilot reported no abnormal engine indications. After about 30 additional minutes of flight, the pilot descended the airplane to an altitude about 1,200 feet above ground level, and the engine subsequently experienced a total loss of power. The pilot manipulated the fuel selector and activated the fuel boost pump, but the engine did not restart. He attempted a forced landing on the roof of an automotive supply store, but the airplane crashed through the roof and came to rest upright inside the building. The pilot added that prior to the flight, he estimated the fuel quantity by visually estimating the distance between the top of the fuel and each wing tank tab, which corresponded to a departure with 27 gallons of fuel onboard and he flew for about 45 minutes on the left wing tank and 23 minutes on the right wing tank before the engine lost all power. Postaccident examination by a Federal Aviation Administration (FAA) inspector revealed that the airplane had sustained substantial damage to the wings and empennage. There was also a fuel sump strainer valve on the underside of the fuselage that was observed in the "locked" open position. The strainer valve was equipped with two "tangs" that extended through a track on the side of the valve. When the tangs were pushed up the valve opened, which allowed fuel to flow out. When the tangs were release a spring pushed the valve to the closed position. The valve could be "locked" in an open position by pushing the tangs up and then rotating the valve counter clockwise until the tangs reached the end of the tracks. When the tangs on the sump valve were pushed in and release on the accident airplane, the valve would spring back to the closed and locked position. The valve remained in the open and locked position when pushed up and turned counter clockwise. According to the FAA inspector, first responders reported that the fuel tanks were breached and there was no evidence of fuel at the accident site. The inspector also stated the sump strainer valve was located several inches below the fuselage and, as a result, it was possible that leaking fuel would fall below and not contact or stain the fuselage. The airplane was examined and the engine test-run at a secure facility by a FAA inspector, who was assisted by a representative of the airframe manufacturer. The engine was test run for several minutes with the throttle in the idle setting and ran smoothly and continuously, but was shut down due to the condition of the engine mounts and induction lines. The examination revealed that the fuel sender, fuel tank gauges and fuel boost pump functioned normally and no leaks were discovered in any of the fuel lines. The airplane was manufactured in 1982 and was equipped with an IO-360-A1B6, 200 horsepower, reciprocating engine. The airplane's most recent annual inspection was completed on March 10, 2014 at a total airframe time of 2,835 hours. The engine had accumulated 908 hours of operation since its most recent overhaul. According to the manufacturer's pilot's operating handbook, at a cruise altitude of 5,000 to 6,000 feet, under standard atmospheric conditions, and at a maximum cruise power, the airplane's estimated fuel consumption was approximately 10.2 gallons per hour. During subsequent testing, a similar airplane was used to check the flow rate through the strainer drain. Approximately 2 quarts were drained through the strainer drain in 2.3 minutes without the engine running. Performance calculations indicated that the engine would have burned about 7.5 gallons from the left wing tank and 3.8 gallons from the right wing tank. Between the airplane's fuel burn and the results from the strainer drain testing, the airplane would have vacated a total of about 28 gallons of fuel in flight.