my turbo diesel is only starting if i fill the high pressure oil pump manually through the sensor hole.i did the injector o rings and now it's not just if it sits overnight.it's everytime you shut it off and turn it on again.it has a new high pressure pump i put in,so that works.is there an oil pressure pump in the oil pan?

 

have you checked the pressure sensor i think most diesel will not start until it has strong oil pressure