All i can tell ya is that when i bought my boat the guy before me ran ethanol in it the 10 or 12 times he had it out in 4 years. 4 stroke efi mercury. I replaced all the fuel lines in it because they all had a hose inside of the hose of what appeared to me to look like a dingy brown shellac. I blew some pieces out that were 10 to 12" long. All of my hoses were that way. May have been ethanol or may not have been idk but the only time I've seen it form like that was in the bowl of a carburetor and the jets.
You do and have worked on a lot more engines than I have but right or wrong I'm sticking with non. I guess I'm gonna fit into the 'ol geezer category. Help me! I've become my 'ol man.
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