I need information how to get a diaphragm and the one-way valves in the bottom of the fuel pump.  I have been gaining oil in the crankcase and my fuel pump does not seem to pump with much volume or pressure.  I have had it apart and there are cracks in the leather diaphragm .  Any parts people I have contacted want to sell me an electric pump; in order to install it I would have to update the ignition system.  I can get the tractor to run on starter fluid, but I can't get fuel to it. I have blown out the lines and probably need filters--the pump will move fuel to the first filter, but the stream is not very robust.