I think it's valid, but I have found that addition of some methanol after washing and drying seems to "reconvert' the FFA's. I tried to do a conventional Acid Step after washing but I found that addition of sulphuric made no difference that I could measure. The methanol cleared up the cloudiness, that I had attributed to the FFA's, all by itself. I'm advocating a prewash pH test with an appropriate indicator (~6.8--7.2?) so that the acid addition is not excessive. (Must try more indicators.) Works for me personally but other operators are still heavy handed. These guys are mature and relatively well educated, what may happen in a village in the Islands bothers me. P.S. If the methanol is left in the fuel does it create a fire hazard in rollovers? Bio and diesel have very high flash points, the addition of volatile components may compromise the safety aspect. Regards from Harry.
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