surok: I wasn't mocking you, it's just that digging up a post from mr2oc on a similar but unrelated matter, and posting it without any reason, led me to think you were making some kind of statement, rather than asking a question? anyhow, if I made you feel that way..I do apologise.
purple5ive: You summed that up pretty darn well..
On the rubber parts: I've seen pumps & hoses affected by Ethanol, mostly from E10 where the stock pump is still used, and mostly done a lot of K's. I experienced it personally in an r33 where I ran E10(95 then) for 18 months. So there's something going on there, over time, and they come out will swollen seals that eventually stop the pump from running. On the other hand, I suppose any pump over 10 years old is rather tired anyway, and needs replacing with an ethanol compatible pump..migh as well be with a smile.
The rubber lines are easy enough to fix.
As for injectors, never seen or experienced any issues, tho I have heard some reports (like tots) of inj seals swelling or inj failing, and some reports from o/s about deposits building up.
The deposits I think, are from the the Ethanol (and this is 100%) breaking down from age, and forming varnish/gum deposits, which it will do after long storage. Plus guys in the northern states & Canada tend to store cars over the winter, so might be something in there. Usually a couple of tankfulls of 98 cleans things up, unless it's let go badly.
AS for the inj seals, most of those are now neoprene anyway, so I assume its the seals themselves.
Injectors..no idea, havent seen any, but all I can think of is if they are cad plated, maybe its pitting. It will affect cad plated items, Ive seen it on pump bodies, and where cad plated tanks are involved.
Hope this helps..just trying to give a complete view, not just the up side..although that is the best mod for less than 20 bucks your ever going to find.