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#1
February 22nd 04, 08:31 AM
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Fuel line thread sealant
What works best for fuel line thread sealant.
Teflon, RTV-silicone? 
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#2
February 22nd 04, 09:26 AM
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On 22 Feb 2004 00:31:39 -0800, (Paul Lee)
wrote: :What works best for fuel line thread sealant. :Teflon, RTV-silicone? Either Fuelube or EZ turn http://www.aircraftspruce.com/catalo...ezturnlube.php Teflon tape and RTV are very bad in a fuel syste. Teflon tape, if it is wrapped beyond the threads, can tear off and clog the system. RTV swells and becomes very soft when exposed to fuel or oil.
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#3
February 22nd 04, 06:38 PM
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NEVER EVER use Teflon tape. regular Pipe dope with Teflon powder works well
but the very best is Loctite PST. -- Cy Galley, TC - Chair, Emergency Aircraft Repair, Oshkosh Editor, EAA Safety Programs or Always looking for articles for Sport Pilot "Paul Lee" wrote in message om... What works best for fuel line thread sealant. Teflon, RTV-silicone?
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#4
February 22nd 04, 07:37 PM
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Just found "TFE Pipe Thread Sealant w/Teflon" that claims to
be good for all threads, fuels, wide range of temperatures. Anybody tried that? Richard Riley wrote in message . .. On 22 Feb 2004 00:31:39 -0800, (Paul Lee) wrote: :What works best for fuel line thread sealant. :Teflon, RTV-silicone? Either Fuelube or EZ turn http://www.aircraftspruce.com/catalo...ezturnlube.php Teflon tape and RTV are very bad in a fuel syste. Teflon tape, if it is wrapped beyond the threads, can tear off and clog the system. RTV swells and becomes very soft when exposed to fuel or oil.
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#5
February 23rd 04, 01:09 AM
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Cy,
Just looked up Loctite PST and it says "Not recommended for use on plastic piping". For example I have a plastic fuel level sensor going into aluminum tank hole piece embeded in epoxy. It seems that the "TFE Pipe Thread Sealant w/Teflon" fits the bill better on that one. "Cy Galley" wrote in message news:sG6_b.381795$na.571587@attbi_s04... NEVER EVER use Teflon tape. regular Pipe dope with Teflon powder works well but the very best is Loctite PST. -- Cy Galley, TC - Chair, Emergency Aircraft Repair, Oshkosh Editor, EAA Safety Programs or Always looking for articles for Sport Pilot "Paul Lee" wrote in message om... What works best for fuel line thread sealant. Teflon, RTV-silicone?
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#6
February 23rd 04, 02:01 AM
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Good catch. I just don't like plastic for fuel or brake lines. I
understand wanting to use a clear plastic tube for a gage but with all the aromatics they put in car and Avgas, plastic may not hold up. We had an new RV-4 with plastic brake lines at Oshkosh that melted a hole in his plastic brake due to the long taxi distance at Oshkosh. Fortunately there wasn't much wind that day. "Paul Lee" wrote in message om... Cy, Just looked up Loctite PST and it says "Not recommended for use on plastic piping". For example I have a plastic fuel level sensor going into aluminum tank hole piece embeded in epoxy. It seems that the "TFE Pipe Thread Sealant w/Teflon" fits the bill better on that one. "Cy Galley" wrote in message news:sG6_b.381795$na.571587@attbi_s04... NEVER EVER use Teflon tape. regular Pipe dope with Teflon powder works well but the very best is Loctite PST. -- Cy Galley, TC - Chair, Emergency Aircraft Repair, Oshkosh Editor, EAA Safety Programs or Always looking for articles for Sport Pilot "Paul Lee" wrote in message om... What works best for fuel line thread sealant. Teflon, RTV-silicone?
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#7
February 23rd 04, 02:25 AM
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I imaging ProSeal would work will, but you would only need to mix up a tiny
amount. How about TiteSeal? You can get it from Aircraft Spruce and it does not harden with age. "Paul Lee" wrote in message om... What works best for fuel line thread sealant. Teflon, RTV-silicone?
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#8
February 26th 04, 12:44 AM
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Somebody mentioned FueLube, and that's what should be used. A workable
alternative is the old Aviation Form-A-Gasket, in the nonhardening form, made by Permatex now. Silicones of any sort, or Teflon tapes, are OUT. Most guys are way too worried about fuel leaks. We're talking about almost negligible pressure here, even in a pump system, and sealants like FueLube will easily prevent leaking. In a past life I ran an air brake rebuilding shop, and was forever getting back valves and compressors with split pipe ports caused by beefy mechanics torquing up the NPT fittings "just to make sure it don't leak." I found that with a bit of sealant, the fitting wouldn't leak when little more than finger-tight. This was with pressures ranging from 15 psi (coolant systems) to 150 psi ( high-end air brakes). Even 1200 psi hydraulics didn't need much tightening. Tight enough to prevent its shaking out is enough, and vast amounts of goopy, dangerous sealants are totally unnecessary. Dan
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