DO NOT use teflon tape on any fitting or line containing hydrocarbon fluid. Gasoline, Diesel etc. It will leak soon after being installed. You will think the fitting is loose and tighten it to stop the leak. It will be OK for a short while and then leak again. About the 2nd or 3rd time you tighten it to stop the leak, you will crack the female fitting.
50 years in the fluid handling industry says I am right. It was embarassing to find out the first time.
SWMBO's '66 Coupe 289, 2-V, C-4(Pony Interior, Rally Pac, A/C & Tiffany Stripe) & An absolutely rust free '65 289-2V C-4 coupe project. Now almost done. Only took 13+ years.