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The kit description says the diaphragm and o-rings are ethanol tolerant. This is a CIS Flowtech modified fuel head I bought around '07. Ran perfect for about 9 years and then something went wrong in the fuel head on number 4. I can't see any tiny holes in the diaphragm but I havn't looked real hard at it yet. The 3 big 0-rings that fit around the control plunger cylinder look a little funky. Uninstalling the cylinder with no oil on them is tough on them so it's hard to say from looking at them.
It's getting new ones and I'll put a little motor oil or WD 40 on them while reinstalling everything so they hopefully slide down into place and don't tear. It's a tight fit.
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