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teflon tape vs. gasoline question...

Discussion in 'The Hokey Ass Message Board' started by tred, May 12, 2008.

  1. tred
    Joined: Mar 20, 2003
    Posts: 2,368


    is teflon tape rated for contact with gasoline or will it fall apart over time?

    i want to make a sight gauge for an aluminum gas tank and don't know what to seal the threaded fittings with.

    is there some sort of brush-on sealant i should use instead of the tape?

    thank you.
  2. brewsir
    Joined: Mar 4, 2001
    Posts: 3,278

    Member deteriorates..just drop a piece in a little fuel and watch what happens to turns to goo. They make a teflon tape for gas lines (natural gas in your home) that comes in a yellow roll instead of blue...I'm not sure how it holds up to gas but it's what I use.
  3. I use a teflon paste that comes in a tube from the hardware store plumbing dept, works on everything and is easy to clean off excess. I recently had a leak on an original model "A" flared fuel line that runs from the tank to the firewall and just a light smear of the stuff on the flare. stopped the leak.
    Teflon tape sometimes is cut by the tightening of the threads and can be passed into the system. especially if used at the carburetor fittings.
  4. V4
    Joined: Feb 14, 2007
    Posts: 146


    Find some Teflon paste pipe dope at the hardware store. It usually has a little brush under the cap. Read the bottle, it should say its rated for gasoline as well as other stuff.
    Model T1 likes this.

  5. The small tubes are cheaper. Just make sure it says that it works with gas!
  6. SinisterCustom
    Joined: Feb 18, 2004
    Posts: 8,277


    There is teflon tape rated for'll say right on the roll. The roll may be yellow like these.

    Attached Files:

  7. Dan10
    Joined: Aug 14, 2007
    Posts: 386

    from Joplin

    I like the paste in a wet application. It flows and seals better from my experience.
  8. I have used paste with moderate sucess on aluminum to aluminum NPT fittings. I tried as an experiment using Anerobic sealant, kickass. No seapage anywhere.
  9. toddc
    Joined: Nov 25, 2007
    Posts: 976


    Teflon tape is a bit of a misnomer. Most so called "teflon" tapes have little to no teflon content. Proper teflon is resistant to nearly any chemical that is in general circulation.

    The "teflon" tape that is supplied with Chinese air tools, however, appears to be made from polyethylene shopping bags:eek:
    tomkelly88, Andamo and pat59 like this.
  10. That stuff aint for gasoline!

    It is for natural gas piping connections....
    verde742 likes this.
  11. Loctite has a teflon bearing paste called PSP that is great on all threaded connections...(permatex and others make similar stuff)

    permatex aviation gasket sealant will do the job well.

    so will loctite medium threadlocker (blue)

    teflon tape sucks....and moves away from threads when tightening fittings...pretty near useless stuff....

    everyone is using teflon bearing paste nowadays...
    gas pumper likes this.
  12. BigChief
    Joined: Jan 14, 2003
    Posts: 2,084


    55willys and racingonerobb like this.
  13. bryan6902
    Joined: May 5, 2008
    Posts: 1,137


    Plastic shopping bags will work in a pinch, if you don't have any other options.
  14. vettes2
    Joined: Jul 9, 2007
    Posts: 288

    from OKC, OK

    Loctite # 565 Thread Sealant is what you need. "Suitable for exhaust systems, air conditioning fittings, fuel lines, water coolant systems and brake
    systems" This is industrial grade Pipe Sealant with Teflon. Item number 56521 comes in a 1.69 fluid oz tube. I have used this on my Three 2 barrel carb setups for 2 different builds over 15 years and never a leak. This is a thick white semi paste like stuff.
    Model T1 likes this.
  15. oldsman71
    Joined: Apr 9, 2008
    Posts: 1,037


    never herd that befor
  16. oldsman71
    Joined: Apr 9, 2008
    Posts: 1,037


  17. SinisterCustom
    Joined: Feb 18, 2004
    Posts: 8,277


    Ya wanna throw down a $20 bet on that holmes???
    I've got a roll of it in my toolbox.....and it says FOR GASOLINE right the fuck on it.:D
    I used it for the 4 97's on my car.....
    56shoebox likes this.
  18. Shaggy
    Joined: Mar 6, 2003
    Posts: 5,207

    from Sultan, WA

    Hmmm i've never had a problem, mabey i'm just lucky
  19. Bort62
    Joined: Jan 11, 2007
    Posts: 594


    JB weld works awesome.

    As long as you don't plan on taking it apart.
    belair likes this.
  20. Toqwik
    Joined: Feb 1, 2003
    Posts: 1,310


    I read on the spectre glass fuel filters and fuel pressure regulator packages it says to seal all threads with teflon tape.
  21. Del Swanson
    Joined: Mar 27, 2008
    Posts: 708

    Del Swanson
    from Racine, WI

    Hey guys, I'm a journeyman steamfitter. I would never use "teflon" tape on any natural gas, or gasoline lines. Like it was said in another response, little bits of the tape can dislodge from the fitting and end up in the tiny orrifices in natural gas valves, or carbs. I know people have used it in the past without problems, but it's not a good practice. If for some reason you can't use a correct paste and have to use teflon tape, start the tape two or three threads up from the end of the fitting, leaving less of a chance of contamination. Plus it looks cleaner when you wipe off the excess paste.
  22. enjenjo
    Joined: Mar 2, 2001
    Posts: 2,672

    from swanton oh

    Rector Seal. Available at most hardware stores.
  23. beamishstout
    Joined: May 8, 2008
    Posts: 18

    from vail, az

    I've had luck with some stuff plumbers and hvac guys use. It's called rector seal. Easy to clean up and doesnt wrap around your fingers every time you try to wrap threads.
  24. for tough to seal fittings use a little of both
  25. Gas is a slang term for gasoline which is not a gas but a fluid.
    Gasses are such things as propane, butane, methane, carbon dioxide, hydrogen, helium, nitrogen, nitrous oxide, argon and oxygen. Gasoline has a higher molecular weight making it a fluid instead of a gas.
    In the end, it all depends on what the manufacturer meant when they wrote gas.
  26. racerlall
    Joined: Mar 18, 2011
    Posts: 98

    from WA

    permatex #2 thread sealant the non Harding its sorta green. I think permatex is pate of lock tight now ?
  27. seb fontana
    Joined: Sep 1, 2005
    Posts: 8,392

    seb fontana
    from ct

    Seven year old thread...Permatex/locktight/Henkel.....I have never seen instructions that say to use a specific Teflon tape for sealing when gasoline is involved..I have just started seeing on TV [them guys know everything, right?] to use a paste sealant along with the teflon, wtf? Supposed to be needed to keep threads from galling?
  28. Blue One
    Joined: Feb 6, 2010
    Posts: 11,458

    Blue One
    from Alberta

    Old thread to be sure, but it needs correct information. Proper thread sealant for gasoline is Gasoila thread sealant compound.
  29. Funny
    I was getting ready to respond and I see I did .....7 years ago lol
  30. Well, someday when your vehicle stops running and you tear into it and find little pieces of Teflon tape plugging up a jet. The stuff can and will shear off if you are not real carful

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