Holley Carb float bowl vent leaking
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=50218
Printed Date: November-22-2024 at 11:09pm
Topic: Holley Carb float bowl vent leaking
Posted By: Lakerider80
Subject: Holley Carb float bowl vent leaking
Date Posted: September-12-2021 at 9:22pm
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I noticed the other day that the carb float bowls vents (the ones on the bowls and not the ones aimed into the intake) were leaking at a pretty quick rate. I pull off the old sealant, clean the metal up with a wire brush and some brake clean and then used some JB Weld SteelStik as it apparently is more fuel resistant than other JB welds. Stopped the leaks and got me back on the water. Just figured I'd share my experience in case anyone else runs across the same issue.    |
Replies:
Posted By: KENO
Date Posted: September-13-2021 at 6:53am
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Those aren't really vents, they're plugs that fill holes that were drilled to allow for drilling/machining internal passages in the bowl. When the drilling/machining is done the holes need to be plugged otherwise they'd be a giant unwanted leak Under the epoxy job that somebody did originally, there's a plug with an O ring. The plug is pressed in and pretty much impossible to get out without destroying it.
The O ring can get old and brittle and then the plug leaks. Your front bowl has 2 plugs like that and the rear has 2 plugs like that I only see pictures of 2 that you did the epoxy job on. I'll guess that the other 2 got epoxied also by whoever did the original "fix" The epoxy fix is pretty common. Whoever did yours maybe didn't do a good prep job Some people will say that you need to replace the bowl, others go the epoxy route with good luck Here's a picture of what the plug looks like  Only one plug was destroyed to get that picture  |
Posted By: KENO
Date Posted: September-13-2021 at 7:25am
Here's a picture with little red arrows pointing to all 4 plug locations on your carburetor |
Posted By: Lakerider80
Date Posted: September-13-2021 at 12:52pm
| I tried looking for the replacement plugs and couldn’t find any. Any idea of a part number or where to get them or if it’s even worth trying to replace them? It’s far from a show boat so I’m really not too worried about the look. Especially if the JB does the trick but I do try to fix things correctly rather than cobbling things together. |
Posted By: Gary S
Date Posted: September-13-2021 at 2:15pm
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There are no replacements you have to replace the complete bowel ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: Lakerider80
Date Posted: September-14-2021 at 9:04am
| Well it looks like the JB weld fix is the way to go then, thats crazy to replace a $0.03 o-ring you have to buy a whole new bowl, and knowing Holley it’s probably at least $50 just for the bowl that will probably end up leaking within a few seasons. |
Posted By: scootdogydog
Date Posted: September-14-2021 at 9:48am
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I understand Gary's statement that the plugs are not available by themselves but o-rings can be bought. I get o-rings at Fastenal, but you'd have to have a plug that isn't jb welded to the bowl in order to replace the o-ring ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=7183" rel="nofollow - 1999 Python 1980 Ski Tique 1968 Mustang WIP |
Posted By: KENO
Date Posted: September-14-2021 at 12:19pm
I guess you're gonna have to explain how to get a leaky plug (that hasn't been epoxied) out of the bowl without destroying the plug
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scootdogydog wrote:Posted By: KENO
Date Posted: September-15-2021 at 8:33pm
Sometimes you throw out that challenge like my quote above and then decide that you should maybe take that challenge yourself. Today, after thinking about it some, I came up with a relatively simple way of getting the top plug out without damaging the plug or the bowl in the process. Side plug.............well that's a different story And as an added extra bonus, you can put it back together with a new O ring. Pretty much any self respecting semi accomplished backyard hack can do it  Will it leak? Beats me, but I'll know tomorrow and post the process either here or in a new separate thread
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Posted By: Lakerider80
Date Posted: September-15-2021 at 9:38pm
| I am really excited to see what you’ve come up with. I doubt I am the only one that’s had this problem with very old and dry O rings leaking enough fuel that a engine fire might be a real possibility. That’d be a real day ruiner. |
Posted By: KENO
Date Posted: September-16-2021 at 12:36pm
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Click on the link for what I did http://www.correctcraftfan.com/forum/forum_posts.asp?TID=50232&title=removing-holley-float-bowl-plugs" rel="nofollow - link
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