It's all good. I was just sayin' is all. The fuel pumps on the burners run at higher pressures than they did when we first started out in the 60's & 70's. I don't really know all that much about the waste oil burners. The one at the municipal garage was set up as a two pipe system with a feed and return back to the tank. They said that one of the difficult things about that system was that it was harder to prime the feed line because the waste oil was thicker.

The Canola sounds like a good idea. The Becketts are decent burners. Simple and reliable. I wonder if the canola would run straight through without the need for any modifications. Maybe a pre-heater to thin the canola so it flows more like #2 or kerosene ?