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You shouldn't need anything like teflon tape if the rubber seal between the tank and the petcock is in good condition.
 

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Two types of petcock.

One bolts to the bottom of the tank, using an elliptically shaped 'O' ring for a seal.

Other type screws onto a spigot, and I'm guessing this is where the Teflon tape might be used, although having said that my CL tap doesn't leak, there is a rubber O ring inside the captive nut on the fuel tap.

spigot2.JPG spigot.JPG spigot3.JPG
 

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I have used teflon tape and it worked fine, I have also done it without anything and that works fine too.
 

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I used teflon tape on my front brake bleeder screw to stop a really slow leak. Didn't have to use it on a new fuel tank petcock, just needed to crank it down quite a bit.
 
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