About two weeks ago I picked up a 1990 wrangler. This is my first jeep so I am not too familiar with them but have a good general knowledge of how everything works. I had some exhaust work done on it and changed the starter. After that it drove fine for a little over two hundred miles. Then, I was taking off from a red light calmly and once I got to about ten-fifteen miles an hour it just cut out completely. It would run on starter fluid and had the original fuel pump so I thought it could be that. A new pump was only $16 dollars so I replaced it. The jeep would still not get fuel to the carb. I then primed the fuel line and it started and ran for about twenty minutes. Then it stopped running again. If I had the mechanical pump installed wrong would it have even ran for those twenty minutes? Any other ideas of what it may be?