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| Moderated by: Greg Fletcher | Page:   1 2 |
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| Stromberg vent fuel leak | Rate Topic |
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| Posted: 11-27-2025 07:37 pm |
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21st Post |
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vnavaret Member 
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JAF6025 wrote:Ok, so I just checked Moss Motors web site and it seems I have a series 3 valve that I put on my just rebuilt Stromberg. Still having a fuel leak coming out of the vent hole at the 10 0-clock position just like member dig had. I am stumped? Did the leak start when you rebuilt your carbs, or was the rebuild an attempt to fix the leak? If the latter, I would suspect that your float has filled with gas. After 50 years the fuel migrates through the plastic so the float doesn’t close the valve. Holding the float up to a light will show if you have this problem. In that case you will want to replace the floats. Vance
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| Posted: 11-29-2025 04:08 am |
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22nd Post |
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JAF6025 Member
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The leak started before the rebuild. It still slowly leaks after the engine is shut down, then stops after I assume the fuel pressure is released. I've replaced the float. After the rebuild I've replaced the gasket under the float valve a couple times ,and added a fuel flow restricter. Going to try a different float valve, ordered all three types from Moss.
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| Posted: 11-29-2025 03:46 pm |
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23rd Post |
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vnavaret Member
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Hmm. Any chance the float bowl vent is clogged or capped off? The float bowl vent must be open to air. If the emissions gear has been altered the float bowl can get pressurized. Oh snap, you said that is where it is leaking, so it isn’t clogged. Another hmmm. You might pull the plugs for the front two cylinders and inspect them. If they are black it would be a clue that something is amiss with the carb other than simple leakage, and correcting that may alleviate the leakage. Restoring any missing emissions gear might help as well. Make certain the gasket between the carb and air box is correctly aligned and has the cutout for the float bowl vent. I occasionally come across carbs that are using SU gaskets, which do not have provisions for the vent opening or the temperature compensation, although why covering the air intake for the compensation would cause a leak is not at all obvious to me. Rereading your post, makes me think that the gasket is not the problem, but I am leaving that thought in my post in an attempt to be thorough. You might consider posting a photo of your carb plumbing as well, sometimes another set of eyes is all it takes. Just spitballing here. =:-o Vance Last edited on 11-29-2025 04:02 pm by vnavaret |
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| Posted: 11-30-2025 02:34 pm |
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24th Post |
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noomg Member
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Regarding the jets if you've got debris in your fuel due to rust or dirt or whatever either jet (Grosse or OEM) can stick. A quick fix would be an in line fuel filter and if it clogs you know where the problem is. Vance raised an interesting point about gas migration. I experienced this but not with the carb floats. When my gas gauge wasn't reading I pulled the tank sending unit and found the plastic float was filled with gas. I checked it throughly for holes or cracks and found none after decades the gas had just gotten in there. Something to consider if your gas gauge is sluggish or reads low.
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| Posted: 11-30-2025 05:35 pm |
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25th Post |
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JAF6025 Member
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Thanks everyone. I'll send some pictures when I work on it today.
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| Posted: 12-01-2025 06:22 pm |
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26th Post |
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JAF6025 Member
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I THINK I'VE GOT IT FIXED. I replaced the float valve with another one exactly like it and placed the thick aluminum gasket under the valve so that the tab on the float itself didn't need to be bent to obtain the correct float level. Maybe because I was adjusting the float level by bending the tab on the float, I was causing the float valve to bind in it's holder. So far so good. Thanks to everyone for the help. LOVE this forum!
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