Some interesting papers on water diesel mixes in that link Kieth. Somewhere in there there must be some indication of the best emulsifiers for diesel and water if not bio, water and ethanol. I couldn't access the link I prefer for detergents, probably down for a while if anyone wants to try it: http://www.chem.wsu.edu/chem240/ester-fats.html The detergents that I was thinking of appear to be sulphonated Fatty Acids. Not too hard to make but contain sulphur. I'm getting the impression that a potassium soap is about as good as it gets for the emulsifier provided that there is no source of calcium or magnesium in the fuel system. I can't imagine why there should be (maybe in the wash water or the water that we are mixing). Lauric Acid is prefered for detergent effects so perhaps a potassium soap of coconut or palm oil would mix the ethanol and water with the bio. I have some coconut oil samples left so I'll make some up and set up a factorial (eventually). Regards from Harry
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