And, did it work..?

Here is what I use for any type of fuel valve. It is a grease that fuel will not dissolve.

https://www.aircraftspruce.com/catalog/cspages/ezturnlube.php?clickkey=42062

I make my own corks from synthetic wine bottle corks. Work a treat, don't leak and immune to ethanol and never had to change them after some 10 years on the bike. Cut to shape and make the hole in the middle with a hot needle.