The pilot reported that, during an instrument flight rules cross-country flight, he realized the airplane was "very low on fuel." He added that, with air traffic control's assistance, he diverted to an airport along his route, which was about 30 nautical miles from the intended destination. He further added that he had difficulty locating the airport visually, and when he did locate the runway, the airplane was "too high" to land. Subsequently, as the pilot continued descending and maneuvering toward the runway, the engine lost power, and he landed in a field. He added that, the airplane "hit the field hard," bounced, and struck a utility pole prior to stopping. The pilot further reported in the NTSB Pilot/ Operator Aircraft Accident/ Incident Report, that he was informed that no fuel was found in the airplane and that the right fuel cap was not installed. He reported that he added fuel to both fuel tanks at the departure airport and there was a "possibility/ likelihood" that he did not secure the right fuel cap during preflight. He added that during the diversion, he did not complete the "forced landing checklist." The airplane was destroyed. The pilot did not report that there were any preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation.