On August 16, 1997, about 1643 eastern daylight time, an Ercoupe 415-C, N2237H, registered to a private individual, collided with an unmarked span guy wire near Siler City, North Carolina. Visual meteorological conditions prevailed at the time and no flight plan was filed for the 14 CFR Part 91 personal flight. The airplane was substantially damaged and the commercial-rated pilot and passenger were not injured. The flight originated about 1500, from the Shiflet Field Airport, Marion, North Carolina. The pilot did not obtain a formal weather briefing before departure and stated that shortly after takeoff, his passenger noted fuel spray coming from the right fuel tank fuel cap. About 20-30 minutes later, the fuel tank sight indicator was indicating 1/4 tank capacity remaining. He elected to divert to the Asheboro Airport to determine the reason for the problem, but he was unable to locate the airport due to his wind overcorrection. He then elected to fly to the Siler City airport but while looking for landmarks, he noted a nearby highway that he thought he recognized. He intentionally descended to note the markings on a highway sign, but collided with an unmarked span guy wire which was between 28 and 36 feet above ground level. The airplane then veered to the left and collided with and remained suspended in the trees that border the highway.