The threads don't play a role in the sealing, the flared contact area between the two components forms the seal. The threads only provide the clamping force. No need to use teflon tape (or any sealant of any kind) on the threads. I use silver anti-sieze compound (a very very small amount) on the threads, I have never seen anything that worked as well to prevent galling of aluminum threads on AN fittings...Just my $.02 -Rob
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1969 Camaro/ Tom Nelson TT 434 / Wayne Due C5 / DSE QLink / and a bunch of other stuff...
Silver anti-sieze is my fav as well on the 37*flare side but still a fitting has usually a npt thread such as 1/4 3/8/1/2 npt that you are threading into something fuel pump intake what have you on the npt side the threads ARE the seal and I always use something on that side. Ill post a pic later as not to confuse, now an fittings that have a seat on the other side such as brakes hydroboost some fuel logs and regulators I only use anti-sieze on them
getting ready to install my ricks tank with the pump in it.sounds like ill tape the fitting directly off the tank and anti seize the rest.thanks again.