I run a couple of yami 225 on my boat. Recently, I have had some problems with the engines, usually one at a time, bog down and stall on me while trolling or off plane. I would squeeze the primer balls and the engine would start again no problem. This usually happens a couple of times in a 1 hour period. I suspect there might be water moisture in my fuel tank. I have already changed the fuel filters but the problem persists. I have been told adding methyl hydrate as a water remover should help. Any suggestions? I really don't want to drain the tank if I don't have to ? Any good fuel additive that fellow forum members use to remove water from fuel?