just an FYI tip. apparently there are different grades of teflon tape. the white stuff is meant for 3/8" and smaller fittings. the pink (high density) stuff is meant for 1/2" and larger fittings. yellow is meant for gas/propane lines.
my 1/2" NPT inlet manifold for my march pump had these pin drop sized leaks no matter what i tried. a little googling, another trip to lowes, some pink teflon tape, and low and behold everything is leak free.