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At some point in the past year, I commented on someones thread, that I was using an O-ring to seal the large drain plugs of my gas tanks. I don't believe this is a good idea anymore.
As I was re-attaching the lower gas tank covers today, I noticed what looked like cracks around the perimeter of the O-ring. After removing one of the plugs, I could see that was the case. I have not put gas in the tanks yet, so no damage/leakage has happened. In the previous thread, Doug offered a Napa P/N for an old fashioned sediment bowl gasket that would work perfectly, but no one, including Napa, has one in my area. I went to my local commercial Rubber and Rigging store and they made me half a dozen in about 5min. For free. They have dies for cutting gaskets.
I wanted to get this out there in case someone saw the thread and planned to use an O-ring. In this application, I don't feel an O-ring is a good idea. Couple of pics.