U.S. stocks fell on Wednesday, as private employers added fewer-than-expected jobs in September, while investors weighed the second day of the government shutdown. Private employers added 166,000 jobs in September, according to the ADP National Employment Report, which is down from analyst expectations of 180,000.The Dow Jones industrial average fell 140.38 points, or 0.92 percent, to 15,051.32. The S&P 500 lost 14.20 points, or 0.84 percent, to 1,680.80. The Nasdaq Composite dropped 24.03 points, or 0.63 percent, to 3,793.98.