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12-12-2020, 05:42 PM | #1 |
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Location: Dublin, Virginia
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Float valve leaking
On a zenith carburetor I have replaced the float valve with two new ones and set it in a jig to adjust the 5/8 level but it keeps overflowing even with three washers. The float checks good too. The only thing I see is a little chunk on the bottom thread. The valves work in another carb so they are good any ideas
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Jimmy Palmer |
12-12-2020, 06:46 PM | #2 |
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Re: Float valve leaking
Often the surface they seal against are pitted. We mill them on Bridgeport so they are smooth.
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12-12-2020, 06:47 PM | #3 | |
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Re: Float valve leaking
Quote:
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www.whidbeymodelaclub.com Last edited by Gary WA; 12-12-2020 at 07:19 PM. |
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12-12-2020, 06:50 PM | #4 |
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Location: Venice, Fl and Marcy, NY
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Re: Float valve leaking
Is it possible that the housing is cracked where the valve screws in? I remember fighting with this leaking issue on my first "A" but I can't remember what finally was the fix.
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12-12-2020, 08:11 PM | #5 |
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Re: Float valve leaking
Someone may have molested the float in an attempt to adjust the fuel level. In doing so the float does not come up straight and it cocks the valve and causes it to leak. The fuel level should always be adjusted with washers under the valve, not by molesting the float.
Tom Endy |
12-12-2020, 08:21 PM | #6 |
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Re: Float valve leaking
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Ruth "Sometimes you really DO need to read the whole thread" |
12-12-2020, 11:48 PM | #7 |
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Re: Float valve leaking
I have found that the float can contribute to the problem. You need to inspect carburetor float hinge bracket, frequently the float valve will wear a dimple in the hinge bracket and the dimple and will impede the float travel and thus not completely seat the needle in the float valve. See the below photos of two floats with dimples from years of contact with the float valve needle.
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1931 160B & 1931 68B If you don't have time to do it right the 1st time, how do you have time to do it the 2nd time? Last edited by 160B; 12-13-2020 at 12:36 AM. |
12-13-2020, 11:51 PM | #8 |
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Join Date: Sep 2016
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Re: Float valve leaking
After chasing an overflowing carb, swapping out parts and float height. And still not fixing our problem, i picked up the float and shook out. Sure enough i could hear fuel in the float, a pin hole leak was detected.Since replacing the float the car and carb run great, no more overflowing.
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12-14-2020, 11:02 AM | #9 | |
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Re: Float valve leaking
Quote:
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12-31-2020, 08:48 PM | #10 |
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Location: Dublin, Virginia
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Re: Float valve leaking
Thanks for all the suggestions. I took the float valve apart as one suggestion cleaned it out although I couldn't see any material in it. Put it back together with 3 washers and on gas level stand like Brattons showed on their web. It was two low so I just put2 washers a red one and silver and it came out right on 5/8. Put. In car and it didn't leak so I reckon there was something I cleaned out.
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Jimmy Palmer |
12-31-2020, 09:12 PM | #11 |
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Re: Float valve leaking
Make sure the heights of the two jets feeding the venturi are correct.
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