Westinghouse nordyne oil furnace model 04md-091a-12-fa ran out of oil, refilled oil tank and bled out. It lights runs for about ten minutes and trips out, it re starts for 3 or 4 times, runs for about 5 minutes, then locks out. I bled it some more but it doesn't get better, what could it be?

It could need a good tune up by a professional which is suggested to be done every year. OR it is possible you still have air floating around in the oil line. OR the oil filter is plugging after a short operating time and could need attention. With oil there are many possibilitys.