Biodiesel is a plant-based "synthetic diesel" fuel. Straight vegetable oil (SVO), used as a fuel, is biodiesel. Waste vegetable oil (WVO), used as a fuel, is biodiesel. Vegetable oil that is processed to change it's molecular structure (I don't know if there's an abbreviation) is biodiesel. That's the way it will be unless the standards folks create completely different standards for SVO and WVO. Yes, standards are needed if this new industry is going to succeed. Straight biodiesel in any form won't work up here in the winter without preheating.

I applaud the efforts of the biodieselers. A hundred years ago the neighborhood blacksmiths built automobiles and engines. It's too bad the original question (the other forum) went from "how do I regulate injection pump pressure with two lift pumps" to the inner workings of the MB lift pump - when the MB lift pump wasn't designed for heated heavy fuels.

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daBenz - 1970 220D