Thanks for the info. Mr. Haiges. I wondered if that was what it was. I think I am going to scrap the thermostat all together and put a 3 port valve in its place. That way I can manually choose when I am sending fuel through it or not. I don't think I want to heat the diesel too much if and when I am running on it rather than oil. Thanks again for the reply. You guys have a great board here and I am happy to be a part of it.

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Keep everything as simple as possible-but no simpler--Albert Einstein