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04-17-2021, 05:35 PM | #1 |
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Location: Raleigh, NC
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Fuel leaking around large brass plug (fuel inlet valve?)
I finally got my 1956 T-bird to start on a newly rebuilt engine after a 5 year saga of replacing tons of mechanicals (engine, Fordomatic, front suspension, brakes, etc.)
Now I have fuel leaking around a large brass plug at the rear of the carb. I think it might be above the fuel inlet valve. There is a rust colored gasket under it. This carb was rebuilt using a comprehensive rebuild kit several years ago but just now being used for the first time. I assume I should buy a new gasket, and or plug? Or could I use some kind of thread sealer to fix it? Here are some pictures that show the plug on the carb and laying on the bench for identification purposes. |
04-17-2021, 06:15 PM | #2 |
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Re: Fuel leaking around large brass plug (fuel inlet valve?)
Mike's Carburetor has a Holley 4000 "Teapot" series on youtube. There are at least 4 parts to the series. If you have the time and patience to watch the entire series, you should find an answer to your question.
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04-17-2021, 09:06 PM | #3 |
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Location: Detroit suburb, MI
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Re: Fuel leaking around large brass plug (fuel inlet valve?)
I don't think the Mike's Carburetor video will give any info about the leak at that brass plug. I've watched them before. I've been rebuilding the Holley 4000 teapot carbs for a long time, and chances are it just needed to be tightened a little more to stop the leak, as long as the round gasket isn't damaged. You need a very large blade screw driver to get it tight enough. I have a Snap-On socket made for it. You can also replace the gasket with an o-ring of the same size.
Sal |
04-17-2021, 09:48 PM | #4 |
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Re: Fuel leaking around large brass plug (fuel inlet valve?)
Thanks, I’ll try the O-ring if I can’t get it to seal.
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04-19-2021, 07:39 PM | #5 |
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Re: Fuel leaking around large brass plug (fuel inlet valve?)
I ended up using an O-ring and it fixed right up. The one I used was from Ace Hardware. The one I used as:
#28 “O”Ring 5/8” O.D. x 1/2” I.D. It was in the plumbing area and there was a note that said “Fits Delta, Cuthbert, Koehler” |
04-20-2021, 11:32 AM | #6 |
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Re: Fuel leaking around large brass plug (fuel inlet valve?)
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Sal |
04-22-2021, 11:19 AM | #7 |
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Re: Fuel leaking around large brass plug (fuel inlet valve?)
I would keep an eye on it for a while. The o-ring used may be made from a material that is usable with fuel but not all rubber like o-ring elastomers are so keep that in mind.
From aviation industry sources, I can pick and choose the correct material for a sealing o-ring but from the average hardware store, the choices aren't very clear. |
04-22-2021, 11:46 AM | #8 | |
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Re: Fuel leaking around large brass plug (fuel inlet valve?)
Quote:
And Very Valid And Good Point ...
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***** - WHY IS IT ... - ... that everything you buy in the grocery store is either wrapped in or contained in plastic but the government doesn't want you to carry it out in a plastic bag? WONDERING IN W(BY GOD)V ...
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04-22-2021, 05:42 PM | #9 |
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Re: Fuel leaking around large brass plug (fuel inlet valve?)
If the Ace Hardware o-ring does deteriorate, CASCO (classictbird.com), offers a new brass cap with an o-ring. I'm assuming the Ace one will work since the packaging said it's compatible with gasoline. I've used one or two in a pinch before without an issue.
Sal |
04-26-2021, 12:51 AM | #10 |
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Re: Fuel leaking around large brass plug (fuel inlet valve?)
I had to resurface the sealing face due to pitting and the fact that someone had dropped it in its past. I made a tool to do it. I threaded a shaft to keep the tool straight.
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04-26-2021, 10:01 AM | #11 |
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Re: Fuel leaking around large brass plug (fuel inlet valve?)
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