So, here is my update. The fuel filter, oil screen and oil level are appropriately working/functioning. The vehicle diesel fuel level read 3/8 of a tank. After contacting a dozen techs, Thor, Mercedes, etc., one tech told me to check my fuel level.
I told him that I know about the fuel level design concept prohibiting fuel to flow to the generator when the fuel tank level is less than one-quarter. He said that he has known where fuel will not go to the generator at even a 3/8 or even one-half level. Sure enough, I filled the tank and the generator has been working since my original posting. Go figure!
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