The one thing I forgot to mention
and I am not sure if this is really important or not seeing as the Teflon tape nor the pipe dope is actually supposed to come in contact with the fuel...
The pipe dope that I saw at NAPA and Fairview was for gas lines.. as in LNG or Propane. PFTE or the yellow Teflon tape is also for LNG or Propane lines.
I don't see any thing really called out for gasoline, so I am assuming and Lord
I hope I am not making a donkey of myself on this.. that because the fuel doesn't come in contact with the tape/dope it doesn't really matter? I am not sure.. but so far I have not had any issues when the tape is applied properly ie - 1 thread back from the end of the fitting.
I keep researching this though from time to time. I tried this as a search string Teflon Tape or Dope for Gasoline Lines
and didn't get a lot of hits that I can see for the fuel line side of the question. However, I like Taunton Press for my Fine Woodworking and the Fine Homebuilding series.. so here is some stuff I found on the Taunton websites..
Taunton's Fine Homebuilding wrote:Teflon tape for residential plumbing is color coded. High-density pink tape is used on water lines; yellow tape is designed for gas-line use. White tape (often low density) is used on water lines.
Tauntons's Fine Homebuilding wrote:Tape is less messy, but there's a caveat: If wrapped wrong (in a counterclockwise direction), the tape can ball up as components are tightened, ruining the seal.
Taunton's Fine Homebuilding wrote:Dope stays gooey. Pipe dope never hardens, so it will never become brittle and flake out of a joint.
From what I can gather reading a lot of this stuff on various forums including a Mitsubishi forum
is that as long as it doesn't come in contact with the gasoline it should be ok. Teflon tape and dope was designed originally for NPT type fittings (which are most of what I use, so that works..) and should work on the NC and NF threads as well.
Boy this can get involved
Apparently the white crud I found in the bottom of my carb a while back was caused by the reaction of the benzene and cycloalkenes. But that is only if the tape is in contact with the gas when applied incorrectly as I had done once. You can see the white gooey residue in the bowl.
Now that I understand the ramifications I use the 1 thread back method and I haven't had any leaks or any build up in the carb.
The other product that I found at NAPA is by Permatex.. but I haven't tried it yet.
This is called out for fuel line fittings, so maybe this is what I will probably go to for pipe dope
Oh, I see Don just posted a link to the Permatex site as I was refreshing this to post.