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The reason I asked about the emulsifying versus demulsifying is because you want it to do the latter and not the former. If you're emulsifying water into the fuel then it is going through the injectors and, being an abrasive, wearing them out. Demulsifying does the opposite and allows your water seperator to do its job. I don't put anything in my fuel but if I did I'd be careful and make sure I knew what it was doing to the water in there.. You may end up doing more harm than good.