Originally Posted by Pablo
Just use the gasoline resistant thread sealer available at most well stocked good hardware stores - it's what we used for hundreds of fuel valve assemblies. Works great. Teflon tape is a PITA, and not all that fuel resistant.
SBP FUEL VALVE
Pablo gives good advice on this one. Gasoline resistant thread sealer in conjunction with the gasket that comes with the kit supplied petcock is a good bet.
I'll repeat something here that I've posted often. Teflon tape is NOT a thread sealer. It is intended as a thread lubricant for pipe (tapered) threads. As a pipe thread is tightened it more or less binds and seals itself due to the taper. Teflon tape acts as a lubricant to allow a tighter fit. It does not seal. If you've stopped a leak with teflon tape it was because it bunched up around the top of the threads and took up some space becoming a gasket of sorts. There are liquid teflon thread sealers that serve two purposes, to lube and seal. Tape is a joke for machine threads as found on the tanks and petcocks of most Chinese kits.