At 1005 central time, a Bellanca BL-17-30A hit a post during a forced landing to a field 1.5 miles from Ohaiwa after a loss of engine power. The pilot was not injured. The pilot said he had just refueled the airplane and asked the lineman to top off the fuel tanks. He checked the right fuel tank visually before takeoff, but did not check the left tank. The left tank was found empty and the right tank was full.