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08-07-2020, 05:45 PM | #1 |
Junior Member
Join Date: Jul 2020
Posts: 4
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Fuel Bowl Question
I have to replace the fuel bowl on my 29; the threads are worn on the inside connection and gas leaks into the cab. With that said, I have a new fuel bowl and I am ready to replace; do I need to use any type of pipe "doping" or "Teflon" on the threads? Question from a brand new 29 owner. Thanks in advance for the help...
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08-07-2020, 05:58 PM | #2 |
Senior Member
Join Date: Jan 2019
Location: Germany, near Aachen
Posts: 1,157
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Re: Fuel Bowl Question
Hi,
Teflon tape is good, but better sealants are available for it. It is important that you use a paste that is resistant to gasoline and alcohol. Silicone pastes are unsuitable!
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Beste Gruesse aus Deutschland, Werner Ford Model A, Roadster, 1928 Citroen 11 CV, 1947 Hercules W 2000, 1976; (with NSU-Wankel Rotary Engine), Canadian version |
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08-07-2020, 08:17 PM | #3 |
Senior Member
Join Date: Aug 2018
Posts: 2,332
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Re: Fuel Bowl Question
Never use the white teflon "plumbers" tape for gas/oil. It is not resistant to oil gas. There is a similar version of tape that is yellow and the plastic parts the tape is wound on is yellow, that is oil/gas resistant.
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08-07-2020, 08:33 PM | #4 | |
Senior Member
Join Date: May 2010
Location: Young Harris, GA
Posts: 1,819
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Re: Fuel Bowl Question
Quote:
The fuel line inside the car (from fuel valve to fuel bowl) uses a tapered tubing end that mates up to a tapered fitting on the fuel bowl. Snug it up and it should not leak. The threads only pull the tapered tubing up against the tapered fitting tighter. The threads themselves do not seal, so there is no need for sealant or tape on them. While you are in there, replace the fuel line also. You can apply a very light coating of a non-hardening sealant, like Permatex #2, to the tapered fitting before attaching the tubing, if you want, as insurance against a weeping fitting. But you really don't need it.
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Jim Cannon Former MAFCA Technical Director "Have a Model A day!" |
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08-08-2020, 06:37 AM | #5 |
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Join Date: Jul 2010
Location: United Kingdom
Posts: 1,441
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Re: Fuel Bowl Question
Hi Jim/GA Whilst I agree that theoretically " ...there is no need for sealant or tape ...." . Many fuel unions are not in the best condition any more. I routinely use oil/gas proof PTFE tape on problem areas and find it a very useful adjunct; particluarly if the components are being re-used. As other posts have stated make sure the PTFE tape is the gas proof type.
Last edited by johnbuckley; 08-08-2020 at 06:42 AM. |
08-08-2020, 08:02 AM | #6 |
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Join Date: May 2010
Posts: 447
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Re: Fuel Bowl Question
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08-08-2020, 08:42 AM | #7 |
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Join Date: Dec 2017
Location: Guthrie, OK
Posts: 1,144
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Re: Fuel Bowl Question
Flare fittings seal between the mating flare joints. No sealant should be required, as Jim says. As long as the threads are good and surfaces smooth you should be able to pull in a good seal.
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08-08-2020, 09:06 AM | #8 | |
Senior Member
Join Date: Aug 2018
Posts: 2,332
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Re: Fuel Bowl Question
Quote:
Hi Jim, As long as you are careful and do not get shards of the yellow tape in the gas, what is the objection to the yellow gas resistant tape? I understand the fix it right the 1st time approach, sometimes a person has reasons to try to make the old stuff work. |
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08-08-2020, 09:30 AM | #9 | |
Senior Member
Join Date: May 2010
Location: Young Harris, GA
Posts: 1,819
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Re: Fuel Bowl Question
Quote:
At least the yellow tape is supposed to not dissolve. On tapered tubing fittings, a thin coat of a non-hardening sealant on the tapered part will usually cover little imperfections on an old, worn, or damaged part. Tape could also do this. But applying sealant or tape to the threads (where most people put it) is not really putting it where it is needed. It needs to be on the tapered sealing surface.
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Jim Cannon Former MAFCA Technical Director "Have a Model A day!" |
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08-08-2020, 09:36 AM | #10 |
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Join Date: Aug 2018
Posts: 2,332
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Re: Fuel Bowl Question
Thanks Jim, learned a few bits of info.
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08-08-2020, 09:37 AM | #11 |
Senior Member
Join Date: May 2010
Location: Young Harris, GA
Posts: 1,819
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Re: Fuel Bowl Question
Yes! I love this stuff! Actually, I prefer the later version, Hylomar AF (Advanced Formula) but I have both. Get it from W.W. Grainger.
I use it on the little plug and gasket under the main jet of the carburetor to stop the fuel from weeping there (drives me crazy). It's also really good on tapered pipe thread fittings. I use a little bit of the Hylomar AF inside the ends of radiator hoses to help them slide on easier and to stop them from weeping coolant without having to go crazy tight on the hose clamps. And the hoses come off easier in the future without having to cut them off.
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Jim Cannon Former MAFCA Technical Director "Have a Model A day!" |
08-08-2020, 04:39 PM | #12 | |
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Join Date: Sep 2016
Location: Roanoke, VA USA
Posts: 1,908
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Re: Fuel Bowl Question
Quote:
I’ve used Hylomar on my radiator hoses too. I agree. It makes disassembly much easier. Sent from my iPhone using Tapatalk |
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