Brake, fuel, flare fitting leaks.

[Inertia]

Time for me to get flamed by the know-it-alls for passing on a tip gained by experience.
I learned this while trying to stop fuel weepage from the dual Holley fuel feeds, that came with the 9/16 fittings at the carb, you try and cinch up that last little bit, and the wrench rounds the nut off, even the near perfect Mac and Snap-On flare wrenches, which I feel are excellent tools.
What I found works, other than the little brass funnel things, is to, here it comes, you can't do that.
Teflon tape is not only a thread sealant but also a friction reducer.
If you put a coupla wraps of Teflon tape on the flare fitting male threads, ( oooow)
You'll find that last little cinch works, you'll feel the wrench smoothly tighten beyond what you could before .
It reduces the friction of the threads, allowing the nut to turn just that little bit more without binding, that stops the leak, without rounding the nut.
This works for brake lines as well, this helped when I used s/steel, which I will NEVER use again for brake lines.
So if you can't find the copper gaskets, a few wraps of Teflon tape, , ,
but, but, but, that's to seal threads, - look up Teflon tape on Google .
If this helps you, great, .

P.S. be sure to remove residual Teflon tape that's visible, or every person that spots it will point and say " didn't you know Teflon tape is only yada yada yada," showing what they don't know ,bs.

Flared fitting Copper gaskets

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Let the flames begin.
Cheers

 

[circlepilot]

Time for me to get flamed by the know-it-alls for passing on a tip gained by experience.
I learned this while trying to stop fuel weepage from the dual Holley fuel feeds, that came with the 9/16 fittings at the carb, you try and cinch up that last little bit, and the wrench rounds the nut off, even the near perfect Mac and Snap-On flare wrenches, which I feel are excellent tools.
What I found works, other than the little brass funnel things, is to, here it comes, you can't do that.
Teflon tape is not only a thread sealant but also a friction reducer.
If you put a coupla wraps of Teflon tape on the flare fitting male threads, ( oooow)
You'll find that last little cinch works, you'll feel the wrench smoothly tighten beyond what you could before .
It reduces the friction of the threads, allowing the nut to turn just that little bit more without binding, that stops the leak, without rounding the nut.
This works for brake lines as well, this helped when I used s/steel, which I will NEVER use again for brake lines.
So if you can't find the copper inserts, a few wraps of Teflon tape, , ,
but, but, but, that's to seal threads, - look up Teflon tape on Google .
If this helps you, great, .

P.S. be sure to remove residual Teflon tape that's visible, or every person that spots it will point and say " didn't you know Teflon tape is only yada yada yada," showing what they don't know ,bs.

Let the flames begin.
Cheers

In aviation applications, we use a product called "fuel lube." (nick name) EZ Turn Lubricant | Aircraft Spruce and if the male fittings get worn due to constant torquing we use Seco-seals https://secoseals.com/aerospace/ all of these products I have used in automotive applications.
Norm

 

[MDchanic]

I haven't tried Teflon tape as a thread lubricant, but I have used Permatex Thread Sealant (both the "High Performance" and "High temperature" variations) as a thread lubricant and a flare surface sealer.

I have NOT used it with brakes, but with flare or compression fittings for fuel, oil, or coolant, I will usually put the thinnest coat (with no "overspread") directly on the flare sealing surface, and sometimes on the threads. This has definitely allowed me to seal threads a number of times that would just not fully seal otherwise (and none ever leaked again), and allowed me to put just that little bit more torque on a fitting.

It is also non-hardening, so allows easier disassembly in the future, without binding or galling.

The stuff never seems to go bad (I've still got the tube I bought for building a 911 engine in 1984), so the few bucks you spend for a tube are a good investment.

- Eric