Originally Posted by austin (Post 124318)

Due to the Ethanol problem I read somewhere that E-10 eats the Teflon tape used in sealing the gas shut off valve into the gas tank. I have hunted high and low and can't come up with it. Does anyone remember what it was? I tried Advanced Auto today with no luck. Thanks

Originally Posted by Bill in NJ (Post 124668)

I bought some of the yellow teflon tape at Home Depot or Lowes. I remember some body saying not to use it on the threads but on the furrel. That is the way I did it and the leak stopped.

Originally Posted by sturgis 39 (Post 125124)

You do not use tape on compression fittings!

Originally Posted by Timothy Kelly (Post 125227)

Although I agree that teflon tape was not intended to be used for compression fittings, my experience has been that it works great to stop leaking ferrules.

Often, the cast iron seat in a carburetor or sediment bowl have very minor defects caused due to rust. Further, once ferrules have been used in a specific joint they take the shape of that joint. Then when you try to use the fuel line with a used ferrule on a different carburetor the ferrule may or may not fit well and may or may not make a good seal.

One solution is to remove and replace the ferrule. Doing so can be tricky, because if you nick the line while removing the ferrule, it will be very difficult to get the ferrule to compress into the nick. If you are not careful, removing and replacing the ferrule may make your problem worse, not better.


An effective, even if unorothodox, solution to a leaking ferrule is try wrap a couple of turns of teflon tape around the ferrule before reconnecting the joint. I have done this several times and have never had a failure.

If you are wondering whether or not the teflon you are going to use resists gasoline, tear off a pice and soak it in a glass jar containing gasoline. I have tried this a couple of times with different teflon tape. So far, I have not melted or disolved or softened any piece of teflon.