What caused you to decide to change the fuel pump (no start)? Is it doing the same thing? Were /are you getting good flow from the tank to the pump? Ensure that the bottom of the tank, the shut off valve, and hose are clear. Where's the filter located (before or after the pump)? Is the new pump from Kubota? It would be strange for the lobe that drives the pump to be the problem. Have you tried cranking the engine over with the discharge from the pump into a can? If you're getting fuel out of the pump, ensure that the cutoff (manual/solenoid)is opening. Good luck