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Fuel line sealant

D

drone_pilot

Well Known Member
Here is hopefully an easy question.

What is a good product for sealing the AN fittings on my fuel and vent lines?
 
Dbro172 said:
Reading in between the line here... You must have some negative experience with ez turn to speak of? And I'm not talking inadvertent application to the flared portion of a fitting.
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Yea I've used it, doesn't work at sealing threads, and it makes a sticky mess.
 
I thought the proper way to seal flared fittings was with torque only and that it was only the tapered fittings that benefitted from sealant...typically the teflon stuff...:confused:

If you have a properly torqued flared fitting that's leaking shouldn't you suspect cracks in the flare?

I have used fuel lube/ EZTurn as a thread lubricant in fuel/oil lines but not as a sealant.
 
Master Designs said:
Walt.....thought I'd pick up some of the Tite Seal since I'm going to re-do all my fuel lines on my 6A, but noticed there is a "Light Weight" and a "Medium Weight". However; there is no description on the difference. Which would you recommend?
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The light weight is what you want.

As others have indicated, sealant is only used on the taper pipe theads, never on the flare/coupling/sleeve/nut assy.
 
I read Walt's recommendation for Titeseal "medium" a few years ago and bought this for my project.
Now flying with no leaks.
I believe everyone was talking about using the sealer on the NPT fitting and not using sealer on the flare. That is a no-no.
 
Walt said:
Tite Seal is much better.. fuel lube must be good for something, I'm just not sure what that is :confused:
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I've found fuel lube to be indispensible as a temporary sort of adhesive for holding a washer or nut to a finger when placing it upside-down or in an area with restricted access. But that's about it.

Loctite 567 and Permatex #2 have worked quite well for me on tapered pipe threads.
 
I've been using Permatex #2 for over 50 years on tapered pipe threads.
Never had a problem.
 
Walt said:
.. fuel lube must be good for something, I'm just not sure what that is :confused:
/QUOTE]

I use fuel lube as a gasket dressing and have great luck with it for that. But some put their gaskets on dry and have success so what do I know. As others mentioned, it works great to hold together washers and nut stacks in hard to reach places when I run out of boogers.
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So do I understand correctly? The sealant goes on the threads only but NOT on the flare, fitting, etc?

I found information for flaring the tubing, but nothing about the proper way to seal the fitting for the permanent install. Is there a publication on this or instructional video, etc? Sorry, no active EAA chapter here and I often have to resort to the web for advice.......and usually find very good advice.

Thanks for all of the input!
 
Walt said:
What is a "thread lubricant" if not used for sealing?
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Well, I've used it effectively to lube the threads to make threading smoother and reduce the likelihood of galling. I have also found that it is innefective as a sealant in some cases such as pipe threads. In those cases it was still very effective as a lubricant but not so much as a sealant.

My experience only and I know others swear by it as a sealant...
 
Overtightening the flares.

As a newbie, I quickly learned that overtightening flared fittings caused leaks and a builder friend told me to tighten the nut until it barely bottomed then go one more flat. After that I had zero leaks.

I also hate those soft "repair" washers Spruce sells. Best to just redo the flare or make a new line.
 
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