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?

[Mike Bellis]

Go to harbor freight and buy the copper washer kit. An aluminum washer could be used too. It needs to crush to make the seal.

Turn the tank upside down and use a very fine wide file to flatten the sealing surface at the threads. You could also use some fine sand paper on a flat block (glass or steel). You need to keep it perfectly flat and 90 degrees to the bung. Worse come to worse, there are some fuel compatable sealants out there.