Because we cannot always fully tighten tapered thread fittings, and because even after fully tightening the fitting a small spiral leak path remains along the full length of threads, a thread sealant must be used during assembly. Sealants appropriate for use on aircraft NPT fittings are Tite-seal, Permatex #2 and Locktite 565. Do not use RTV, Teflon tape or Fuel Lube on NPT fittings.
Be cautious with EZ turn. I recall Don Rivera saying one of the common blockages they see in FI overhauls is a bit of fuel lube, Remember, it doesn't dissolve.
I'd suggest something traditional, like brown Permatex, and make sure it's not anywhere near the tip of the fitting.
EZ turn should work for you. the fittings should be NPT pipe (tapered) threads which should seal.
-Marc
Permatex #2 is at every auto store so easy to come by....
Permatex isn’t a thread sealer either.. here’s from the manufacturer:
Suggested Applications: Valve cover gaskets, and oil pan gaskets.
Locktite 567 from Amazon, shopped to your door next day. It’s great stuff.
i know lots use permatex #2 but the label says fuel resistant, not fuelproof. if you test it in a jar of fuel you will see.
dan, so then is it a disadvantage that a sealer ,like 567 doesn't dissolve in fuel?
One man's opinion, but for fuel systems I want a sealer which is easy to clean out of a fitting when I take it apart, and dissolves if it escapes into the fuel flow.