“What I Learned Today” With Jeff Smith — Ethanol Isn’t The Bad Guy

I have rubber items in my fuel system, no styrofoam...

Same as type of example putting a tooth in Coke for a few days. Know anyone with a mouthful of coke that long. Everything in context.

Which attacks the rubber? That's the pressing item. Needle and seat O-rings shrinking, etc.

No doubt the chemicals in fuel can be nasty.