Gas tank leak

I just dealt with this so I'll let you know what I did.

I ordered a lock ring and gasket from Jegs.

Went to install it and even though the gasket was the same thickness, it wasn't even tight when I'd turn the lockring.

I removed the gas tank and made myself a gasket "spacer" out of gasket material. I put that on top of the rubber gasket and in between the lock ring. Now it was tight and I tapped the lock ring all the way until it stopped. Hasn't leaked since.

Be sure to put some vaseline on the gasket in case it leaks again, you don't want it coming apart if you have to pull it back out. No need to use any kind of sealant becuase the gas will just eat it away. The tab should sit in between the bump and the prong. I personally wouldn't try cork but I'd like to hear how it works out.