You have an International Ranger, which is much different than the North American Ranger.
I know a bit about diesels but it is just general knowledge.
Has any work been done in the last year or so on the fuel system, especially the injectors?
If so then most likely issue will be a leak, bad seal, causing low fuel pressure no start after engine is warmed up
It could also be a bad IPR valve, same problem low pressure so no start until engine cools down.