Need help with diesel fuel system. engine starts and runs for 1 or 2 minutes and then runs out of fuel. Replaced fuel feed and returns lines, two filters and cleaned the extra filter assembly. The feed bowl has fuel in it when it quits but there is no fuel at the injector pump or the injectors. When I open the bleed screw at the first filter after the fuel pump I do not have fuel but there is fuel in the first inline filter because I see it in the bowl. Could this be my fuel pump because it is not sucking it out of the first filter assembly? Where can I get a pump or do they make a rebuild kit? How can I check the pump? Can I just connect a line to the first filter from a jar and see if it sucks fuel, then I will know the tank assembly is ok? Thank you for your assistance.