I think this was the original older post mentioned that Ken W first posted a few years back. After seeing that I bought some and used them on the early OMC fuel pumps and they seemed to work fine. I soaked a piece in ethanol gas for more than 6 months and it held up fine. But one of the comments made about those was that they aren’t reinforced like some diaphragm material is and long term might be a problem. Ollie’s is always a good option.
http://www.pfs-ware.com/Parts/OllieParts.htm
