06-06-2021, 08:32 PM | #1 |
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Join Date: Nov 2016
Posts: 25
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Carb wicking
I have 12 Model A carbs, both Zenith and Holley, that wick gas up the inner bowl sidewalls with gas at the 5/8" level inside. They will leak over the gasket surface and run down the outside of the bowl. The float valve in the cover is not to blame because it is not installed on the bowl. Does anyone else find this condition and is this a normal occurrence? Can a gas tank sealer be painted on the inside walls of the bowl?
Thank you for your input!! Don |
06-06-2021, 09:18 PM | #2 |
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Join Date: May 2010
Location: Portland OR
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Re: Carb wicking
https://www.fordbarn.com/forum/showthread.php?t=257165
https://www.fordbarn.com/forum/showthread.php?t=257476 https://www.fordbarn.com/forum/showthread.php?t=278162 https://www.fordbarn.com/forum/showt...72#post1939972
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06-06-2021, 09:28 PM | #3 |
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Re: Carb wicking
... deleted. Wrong forum.
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Ray Horton, Portland, OR As you go through life, keep your eye on the donut, not the hole. Last edited by 700rpm; 06-06-2021 at 09:40 PM. |
06-07-2021, 09:57 AM | #4 |
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Re: Carb wicking
Have you tried MMO in the gas to make it slippier?
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06-07-2021, 10:02 AM | #5 |
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Location: Long Island, NY
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Re: Carb wicking
The engine sits in the frame at a 3-degree slope to match the drive-line angle, so the carburetor is level at this angle.
There has been trouble with poor fitting gaskets. Also there are vent holes in the float bowl that will leak gasoline if the gasoline level is excessive. Now I give you colored balloons and red arrows too.
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Bob Bidonde Last edited by Bob Bidonde; 06-07-2021 at 10:20 AM. |
06-07-2021, 10:16 AM | #6 |
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Re: Carb wicking
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If you look at the carburetor repair manuals ("Restoring The Model A and B Carburetors", Rex Reheis), the float level does not have to be precisely at 5/8 in. down. As long as the Compensator Jet in the carb bowl is always covered with gas, the level can be lower. I like 11/16 in. but less than 3/4 in. to prevent weeping as long as the car doesn't stall at stop signs. I feel it is more conservative setting to prevent gas odors. Ed |
06-07-2021, 11:17 PM | #7 |
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Location: Portland OR
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Re: Carb wicking
Guys he has been asking this same question starting back in Jan 2019, that are what the links are.
Yes gas can creep up the side of the bowl and maybe over the top, that is why there is a gasket. I did try putting some gas in an Zenith bottom section without top and yes it did creep up the side over time. Just the nature of the beast. Might be the shape or unfinshed surface? Have a good shut off valve, run the carb dry and forget it. Read his question, he is not asking about a built carb. He is just putting gas 5/8" deep in the fuel bowl with no top on.
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I know the voices aren't real but damn they have some good ideas! Last edited by redmodelt; 06-08-2021 at 03:19 PM. |
06-08-2021, 11:58 AM | #8 |
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Location: United Kingdom
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Re: Carb wicking
I'm always intrigued when I read on the barn about carbs wicking so much the fuel overflows, another one that comes up a lot on the barn is the cap and main jets needing to be dished to prevent capillary overflow. this sounds like the discovery perpetual motion for some lucky (or maybe unlucky) owners
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