Last summer I pulled my re-circulation valves (part number 392988) for my '84 Johnson 115 while diagnosing an idle issue [which I am not going to rehash in this thread]. Not a single one of them 'worked' as the ethanol over time had turned the black rubber in to a gooey mess. I haven't touched the boat since then, but now I'm back at it and looking at these parts new, they are about $25 a piece. SHEESH! Are they really that important to have? What would the implication be if I just cleaned out the black goo and put them back in (essentially no check valve functionality)?