I have a 1986 Cummins Diesel in my Allis backhoe. All of a sudden she won't run right. She will start and run for 30 seconds then dies and won't restart. Wait a day and she will start again. Got some suggestions here and checked the tank vent. checked for bacteria in the tank, all good. I pulled the fuel line to the engine drivin pump and fuel flows like crazy. Then after the pump and pumped with the manual handle and fuel flows great. Just before the injector pump there are bleeders. I pulled them and turned the engine over, fuel flows great. I disconnected the injector lines and get drops of fuel, hardly any. You are probably going to tell me the injector pump is bad? But all of a sudden like that? Usually from my experience they go slowly. Get worse and worse. this was from working great to nothing in one run? I did maybe let it get low on fuel and try starting it. Then filled an bled it. She ran after that ok. Could that have caused my problems?