Gas tank bungs leaking..., Any tricks to make them seal better? Options

[bigkensteele]

I pulled the tank and completely re-plumbed my fuel system, including new little red seals on the bungs at the bottom of the tank. Cleaned all the hardware thoroughly before re-assembly.

Now, the garage smells like a refinery.

Unfortunately, the bungs are leaking like crazy. Not quite dripping, but they are wet enough to be the obvious source of my leak.

Any tips on getting them sealed up properly? Is there only supposed to be one little red seal on each bung, or two?

[bigkensteele]

I ended up pulling the tank and filing the mating surface flat as Mike suggested. I also bought the copper washer kit from HF, and the 3/8" fit perfectly. I used Indian Head gasket sealant on the mating surfaces and put it all back together. So far, so good, but I am going to give it a while before I fill the tank. I have enough gas cans to hold about 5 gallons, so I won't run any more than that until I KNOW it is no longer leaking.

Thanks for all the suggestions.