David, there is not supposed to be Teflon tape used on any propane lines. There should be an O ring on the left hand thread male connector that seals the tapered seat. With the corrosion on your connector I would suggest you go to a modern right hand thread connector like your BBQ tank or check for an O ring in the groove Buy some liquid pipe thread Sealant suitable for propane if you change the connector. When you are done using the tank you should shut it off and note the pressure in your system. It should not be empty when you go to open the tank next time it should be close to the same. The gauge is meant for you to do a pressure test every time you use the tank. If you suspect a leak use water with a little dish soap to wet the joints until you find that leak. If there is a leak it will generate bubbles. Propane detectors are great for peace of mind. Having a leaky propane system is like sailing a bomb. If you aren’t 100% positive, a licensed gas tech won’t cost you too much to check it out. Better safe than sorry. Len Mitchell Crazy Legs 1989 37+ Midland On.
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