teflon tape okay to use on carb? - Chevelle Tech
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post #1 of 11 (permalink) Old Dec 30th, 09, 9:09 PM Thread Starter
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teflon tape okay to use on carb?

I'm having a heck of a time getting the rear fuel nut to seal up (weeping gas) on my SA 770 carb and was told to try using teflon tape on the threads. Is it okay to use teflon tape for this application guys? If not, what other things can I try? I am afraid to crank down on the sucker for fear of stripping out the threads. Thanks.

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post #2 of 11 (permalink) Old Dec 30th, 09, 9:30 PM
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Re: teflon tape okay to use on carb?

Fuel eats white teflon tape/silicone after a little while so even if it seals at 1st it will leak later on.

Use permatex #1 thread sealer that's resistant to fuel/oil/solvents ,apply it as instructed on pkg and let dry overnight before firing up the motor,that should hopefully stop fuel leaking past threads.

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post #3 of 11 (permalink) Old Dec 30th, 09, 9:30 PM
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Re: teflon tape okay to use on carb?

Use the yellow tape made for gas.

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post #4 of 11 (permalink) Old Dec 30th, 09, 10:00 PM
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Re: teflon tape okay to use on carb?

James, If it's leaking at the line the double flare is what seals not the nut. You can try getting a flaring tool and use the taper to reform the line. If it's leaking at the adapter, there should be a metal washer on it. Sometimes you have to put an open end wrench on the adapter and crank down the nut on the line with a tubing wrench. You really shouldn't use any sealer.

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post #5 of 11 (permalink) Old Dec 30th, 09, 11:28 PM Thread Starter
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Re: teflon tape okay to use on carb?

Jeff, yes, the metal washer is there. I'll go ahead and snug it down a little more and see if that does it. If not, I'll try the sealer. Thanks all.

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post #6 of 11 (permalink) Old Dec 30th, 09, 11:41 PM
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Re: teflon tape okay to use on carb?

Never use tape on any flare nut, use only oil on the Threads.
BUT a little pipe dope on a flare seat won't hurt anything.
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post #7 of 11 (permalink) Old Dec 31st, 09, 1:06 PM
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Re: teflon tape okay to use on carb?

I vote for the flare sealing w/o sealant. I would use teflon paste vice tape anywhere there is risk of tape pcs getting into the system.

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post #8 of 11 (permalink) Old Dec 31st, 09, 1:22 PM
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Re: teflon tape okay to use on carb?

just in case nobody else says this: never use teflon tape on a carb. teflon tape in a thread sealant, so are those other things mentioned. On a GM car at least, there is no fitting in the fuel system that relies on threads sealing. It's always a gasket, O-ring or flare fitting. If the flare, O-ring or gasket is leaking using teflon tape is not the solution.

ever notice what happens to teflon tape when you take the fittings apart? Long thin strings of teflon? Guess what happens when these strings get in your carb?

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post #9 of 11 (permalink) Old Dec 31st, 09, 2:27 PM
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Re: teflon tape okay to use on carb?

Quote:
Originally Posted by Dean View Post
Never use tape on any flare nut, use only oil on the Threads.
BUT a little pipe dope on a flare seat won't hurt anything.
I had a flare nut fuel fitting that just wouldn't stop a little seepage. Per advice I saw here on TC years ago I put a little liquid teflon thread sealant (the Permatex good stuff) on the BACKSIDE of the flare and a little on the threads of the nut. Stopped the seepage and none since.

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post #10 of 11 (permalink) Old Dec 31st, 09, 6:54 PM
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Re: teflon tape okay to use on carb?

I agree with all those that have said that teflon tape should not be used. One of the easy and helpful sealants to use around carbs is some stuff called Pliobond. It was originally designed to be used for repairs to life rafts and such. Excellent stuff to use on threads used around gasoline. Gas won't cut it and the stuff remains pliable (thus its name). It doesn't take much to be effective, either. The stuff is available from McMaster-Carr in tubes.

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post #11 of 11 (permalink) Old Dec 31st, 09, 7:07 PM
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Re: teflon tape okay to use on carb?

Quote:
Originally Posted by Chevyrelic View Post
...Is it okay to use teflon tape for this application guys?...Thanks.
No.

Quote:
Originally Posted by Tom Mobley View Post
just in case nobody else says this: never use teflon tape on a carb. teflon tape in a thread sealant, so are those other things mentioned. On a GM car at least, there is no fitting in the fuel system that relies on threads sealing. It's always a gasket, O-ring or flare fitting. If the flare, O-ring or gasket is leaking using teflon tape is not the solution.

ever notice what happens to teflon tape when you take the fittings apart? Long thin strings of teflon? Guess what happens when these strings get in your carb?
As usual, Tom is correct.

You do not need to use teflon tape on the fuel line fittings, and doing so will often result in problems. The fuel fitting threads play no part in the sealing function, that is solely the responsibility of the flare itself. If you have a leaky line, either repeatedly loosen/tighten it to burnish it in, and if that fails to resolve the issue, check the components for cracks, nicks, burrs or other defects, and replace the defective component if any issues are found.

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