Wow, didn't expect this question to take on so much. Ya my little deer is a 850 (yanmar) diesel engine from the 1980's. All I was hoping to do is be able to pump fuel from my heating oil tanks rather than haul 5 gal. cans to and from the gas station. I can get Off road Diesel at the gas station and on road as well, however the guy that supplies the off road, pumps so little of it, that it is nearly the same cost as over the road at the larger gas station. We will be opening our place in the North East Kingdom of Vermont next week, at witch point I guess I will see about getting a small amount Diesel (off road) delivered when we top off the fuel oil tanks. At which time I'll report back as to what our fuel supplier has to say.