At 1645 central time, a Cessna 182G struck a levee during a forced landing following a loss of engine power near Tuckerman. The pilot sustained minor injuries and his passenger was seriously injured. The flight had been airborne for about 2 hours and 10 minutes when the engine began sputtering and quit. The pilot attempted to glide to a grass airstrip but hit about 60 feet short. Examination showed the left fuel filler cap was loose and its clip was broken. The fuel tanks were topped off before takeoff and the pilot had put duct tape over the left fuel filler cap, but the fuel still siphoned out of the tank.