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teflon tape

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Dick Calland

09-26-2003 12:39:46

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Is it a bad idea to use teflon tape on (tractor fuel system) gas lines?

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george md

09-26-2003 22:44:18

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Re: teflon tape in reply to Dick Calland, 09-26-2003 12:39:46

Dick,

Permatex # 14 H is teflon in a smooth paste

and works as good or better than the tape without

the problems and inconvenience of tape .

george

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rustyfarmall

09-26-2003 15:59:50

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Re: teflon tape in reply to Dick Calland, 09-26-2003 12:39:46

The only place I can think of where the teflon tape would do you any good is where the sediment bowl threads into the fuel tank, I always use it there. The rest of the connections are flared type fittings, and the tape will serve no useful purpose.

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Chris-se-ILL

09-27-2003 08:21:37

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Re: Re: teflon tape in reply to rustyfarmall, 09-26-2003 15:59:50

{let me preface this post by saying, I am not trying to start an argument!}

Dick, even though the fuel lines are flared fittings.... they still need some sealant on the threads (IMO). And teflon tape (applied properly) is the best thing to use on them. I do know that on an older automobile carburator such as a Rochester Q-jet, you DEFINITLEY have to use a thread sealant. Even though the fitting is flares at the fuel bowl. I have seen several vehicles burned up because the person that worked on the vehicle did not use teflon tape on the flare fitting! I have seen the fuel line on my Farmall 560 dripping at the flared fitting where it enters the carburator, when I have not used tape on the threads. Any little nick or deformity in the flared area will allow some seepage. The teflon tape just gives a backup to the sealing properties of the joint.

I have used LOTS of thread sealants (pastes, tape, liquid sealants...), I like teflon tape for some applications. Flared fuel lines are one of those places. It is just a little extra insurance against seeps and drips!

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Ray,IN

09-27-2003 18:27:26

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Re: Re: Re: teflon tape in reply to Chris-se-ILL, 09-27-2003 08:21:37

Do you have your brake line flared fittings taped also? They develop many times more pressure without leaking. Usually the cause of flared fittings developing a leak is because someone overtightened them, cracking the flare or the brass fitting.

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09-27-2003 15:43:22

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Re: Re: Re: teflon tape in reply to Chris-se-ILL, 09-27-2003 08:21:37

Teflon tape is not designed to seal but to lubricate. The reason the flare fittings leaked was because they were not tight enough. The tape allows the fitting to be tightened more. The same is true for pipe fittings.

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Ken

09-27-2003 17:24:33

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Re: Re: Re: Re: teflon tape in reply to GK, 09-27-2003 15:43:22

Teflon tape may be designed to seal but most people use it to seal and it does seal.

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William

09-26-2003 19:52:19

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Re: Re: teflon tape in reply to rustyfarmall, 09-26-2003 15:59:50

I agree and I just did so this past week. Changed the fuel sediment assembly and teflon taped the unit where it screwed into the fuel tank. Worked fine so far on my '51 TO30

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TD9Crawler

09-26-2003 14:38:49

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Re: teflon tape in reply to Dick Calland, 09-26-2003 12:39:46

I prefer not to see teflon tape on any type of fittings on a tractor or vehicle. As a machinist, I made my living rebuilding and doing automotive machine work. It was amazing where you would find bits of teflon tape, black vinyl tape, silicone sealant and cork gasket material. Quite frequently the oil pickup screen would be half plugged with the stuff and even the oil pump gears would be mushed full of the debris.
Also saw a vehicle fire at the race track where a bit of fitting tape had tore off and stuck in the needle and seat, causing the carb to flood over. Luckily plenty of extinguishers around.

I have also seen very neat jobs done where it would probably never cause a problem.
IMHO

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09-29-2003 18:16:11

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Re: Re: teflon tape in reply to TD9Crawler, 09-26-2003 14:38:49

I am a machinist and when I install a flare fitting I use nothing but oil to lubricate the threads. Teflon tape is better suited for pipe threads and must be applied as Ray stated. If a flare fitting doesn't seal with oil, the flare or fitting is defective. Teflon tape or sealent on this type fitting is a patch job looking for trouble.

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Ray,IN

09-26-2003 18:21:32

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Re: Re: teflon tape in reply to TD9Crawler, 09-26-2003 14:38:49

I agree. Teflon tape is a great way to create more work if applied incorrectly. Applying it correctly usually does not cause problems but most guys just grab a roll and begin wrapping it around threads. The correct method of application is to begin furthest away from the end of the pipe and wrap the tape the same direction as tightening the threads, overlapping the tape approx. 1/2 onto the previous wrap and stopping 3 threads from the end of the pipe. I use plain ole brush-on non-hardening thread sealing compound designed to seal gasoline, LPG, water, antifreeze, etc.

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