Thanks, Moonpup!
I’ll try Richard after I finish my experiment with a hack to the gasket. Got the idea on an older thread on the forum. I’ve used a wine bottle cork, the kind that uses small bits of ground up cork that’s molded to shape and held together with some type of glue. I first sliced off a few thin pieces, punched a few holes in them then soaked them in gasoline for 24 hours. They held together fine, and swelled a bit as you might expect.
Then I removed the petcock lever, spring washer and old gasket. Next, I cut a slice of cork as close to the same thickness of the original gasket as possible, using a sharp knife. Checking the cork diameter, found to my delight it was perfect! So, I then pressed the cork in position to hopefully make an impression of where the holes needed to be punched. Worked perfectly. Lastly, used a hole punch to make the holes.
Reassembled the petcock lever, added some gas to the tank to test. No leak in off position, no leak in on position, slight leak in reserve. I’ve let it all set overnight to gibe the cork time to swell, hoping the swelling will cure the slight leak on reserve. Will report back when I test again later today.