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Old 12-17-2005, 10:36 AM
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teflon tape,yes or no?

i need some info about using an fittings,im plumbing my fuel system and i have never used them,do i need to use any teflon tape on them cuz i have two that screw into the carb then two that screw onto those.i have a fuel y block from moroso thats brass and aluminum and im pretty sure i need tape on it. and on the gauge.

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Last edited by rebelcowboy50; 12-17-2005 at 10:43 AM.
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Old 12-17-2005, 10:51 AM
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Quote:
Originally Posted by rebelcowboy50
i need some info about using an fittings,im plumbing my fuel system and i have never used them,do i need to use any teflon tape on them cuz i have two that screw into the carb then two that screw onto those.i have a fuel y block from moroso thats brass and aluminum and im pretty sure i need tape on it. and on the gauge.

Most people don't use any at all. The idea is to prevent the threads from seizing together. The pipe thread taper itself is to stop leaks.

yes on pipe fittings, no on flare fitting threads.

one wrap in the counter rotating direction, skip the lowermost thread so as to not get a thread of teflon into the system.

You can also use copper anti-seize compound from Felpro. just a drop.

edited=== See entry below..... Don't use tape....


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Last edited by xntrik; 12-17-2005 at 11:09 AM. Reason: after thought
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Old 12-17-2005, 10:53 AM
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teflon tape

so non on the an fittings and yes on the fuel block
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Old 12-17-2005, 11:05 AM
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Quote:
Originally Posted by rebelcowboy50
so non on the an fittings and yes on the fuel block
NO TAPE

AN fittings are pipe thread.... they are just aircraft grade materials, hard ALUMINUM..... which galls easily...etc.

Pipe thread is tapered so that the more you tighten the fitting, the fatter the fitting gets into the hole sealing the thread leak.

The taper on pipe thread (NPT) and the flare on flare fittings is what seals the liquid. The tape or anti-seize is to prevent the threads from welding themselves into the hole.

Thinking about this more..NO TAPE = I would suggest a drop of liquid teflon pipe sealer rather than tape. It is easier to use and less of a bother if some gets into the lines. You can put a drop on the brass flare threads to prevent galling also.

Last edited by xntrik; 12-17-2005 at 11:12 AM.
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Old 12-17-2005, 11:12 AM
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I agree. I recently couldn't figure out why a Q-jet I had rebuilt was flooding. After checking float level, etc, a friend discovered it was teflon tape from the fuel line connection.
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Old 12-17-2005, 11:16 AM
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Correct no tape/sealer on the AN side of the fitting, but lets remember there are NPT (pipe) to AN fittings. You do need to seal pipe threads. I never use TAPE in a fuel system I use paste. As mentioned above it only takes a litle piece of that tape getting fre to give you fits. There are places it's fine to use tape, I just don't like it for fuel systems.

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Old 12-17-2005, 01:25 PM
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teflon tape is bad "ju-ju" when it comes to fuel systems. if you need to use something to seal the thread, teflon pipe sealant works well, it's what i use. i bit on the messy side though...................pipe sealant "crayons" work well to, clean up easier, however, they sometimes "crumble" apart when you use them, and never seem to last real long............
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Old 12-19-2005, 01:07 PM
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Quote:
Originally Posted by xntrik
AN fittings are pipe thread....
No, they aren't. -AN fittings seal based on the interaction of the tapered part at the end of the male fitting to a similarly tapered part inside the female fitting. No teflon.

AN fittings are different than traditional "flare" fittings, like on brake lines and your original fuel system's hard lines, so keep that in mind too. But, you don't need to use pipe goop on flare fittings either.

Pipe (npt) threads - on pipe threaded fittings, the threaded part is actually tapered slightly along the length of the threads, and the sealing has to occur over the threads. You need an additional sealant here, but I wouldn't use tape. Use Pipe thread sealant with teflon, availible in small tubes or bigger jugs. You'll never use teflon tape again, even for home plumbing.
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Old 12-19-2005, 02:22 PM
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AN fittings have a 37* taper/flare
Typical auto fittings, brake, fuel hard line, etc.. are 45* flares

Pipe threads and AN threads are two different things. benwantland, covered that.
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Old 12-19-2005, 05:50 PM
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And AN stands for Army/ Navy because that is what it was originally designed in use for.
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Old 12-19-2005, 06:19 PM
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This is what I do for fittings, if you can screw the fitting in more than 1 1/2 turn by hand you should use some kind of sealant. If the fitting tightens up under 1 1/2 turns then most likely you won't need sealant. I learned this trick from a old pipe-fitter when I use to work industrial construction. If you don't feel like this method is safe, I would use some kind of thread sealant and stay away from the Teflon tape, but this is just me.
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Old 12-19-2005, 06:57 PM
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Quote:
Originally Posted by camaroman7d
I never use TAPE in a fuel system I use paste.
Royce
Ditto on that.
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