Hello! Log in or Register   |  Help  |  Donate  |  Premium Membership  |  Buy Shirts See all banner ads | Advertise on TheSamba.com  
TheSamba.com
 
Gas Drip at Mounting Flange on 30/31 Solex
Forum Index -> Beetle - Late Model/Super - 1968-up Share: Facebook Twitter
Reply to topic
Print View
Quick sort: Show newest posts on top | Show oldest posts on top View previous topic :: View next topic  
Author Message
AR
Samba Member


Joined: September 10, 2025
Posts: 23
Location: Southern California
AR is offline 

PostPosted: Tue Dec 16, 2025 7:32 am    Post subject: Gas Drip at Mounting Flange on 30/31 Solex Reply with quote

1970 Bug with a rebuilt 30/31 done by other.

I just installed it as the final part to getting her back on the road. Everything went well and drove well. But I noticed that the mounting gasket(s) were wet with gas which led to a small drip coming off the mounting studs.(see picture)
There are 2 gaskets that are installed because of the emissions control bracket.
I do not know if that is correct or not and may have nothing to do with the gas issue.
Do I have a float problem, a gasket problem or something else?
Thanks
AR


Image may have been reduced in size. Click image to view fullscreen.
Back to top
View user's profile Send private message Gallery Classifieds Feedback
messenger123
Samba Member


Joined: July 19, 2025
Posts: 49
Location: IA
messenger123 is offline 

PostPosted: Tue Dec 16, 2025 7:39 am    Post subject: Re: Gas Drip at Mounting Flange on 30/31 Solex Reply with quote

Check the throttle shaft to see if that's the source of the leak.
Back to top
View user's profile Send private message Gallery Classifieds Feedback
AR
Samba Member


Joined: September 10, 2025
Posts: 23
Location: Southern California
AR is offline 

PostPosted: Tue Dec 16, 2025 8:42 am    Post subject: Re: Gas Drip at Mounting Flange on 30/31 Solex Reply with quote

No leaks from the throttle shaft
Back to top
View user's profile Send private message Gallery Classifieds Feedback
messenger123
Samba Member


Joined: July 19, 2025
Posts: 49
Location: IA
messenger123 is offline 

PostPosted: Tue Dec 16, 2025 8:46 am    Post subject: Re: Gas Drip at Mounting Flange on 30/31 Solex Reply with quote

AR wrote:
No leaks from the throttle shaft


Pull the air filter and look down the carb throat with a flashlight and see if you can see anything leaking.
Back to top
View user's profile Send private message Gallery Classifieds Feedback
Cusser
Samba Member


Joined: October 02, 2006
Posts: 33479
Location: Hot Arizona
Cusser is offline 

PostPosted: Tue Dec 16, 2025 12:08 pm    Post subject: Re: Gas Drip at Mounting Flange on 30/31 Solex Reply with quote

1970 VW is exempt from California emissions testing. If mine, I'd remove that emissions control bracket and the throttle positioner part.
_________________
1970 VW (owned since 1972) and 1971 VW Convertible (owned since 1976), second owner of each. The '71 now has the 1835 engine, swapped from the '70. Second owner of each. 1988 Mazda B2200 truck, 1998 Frontier, 2014 Yukon, 2004 Frontier King Cab. All manual transmission except for the Yukon. http://www.thesamba.com/vw/forum/album_page.php?pic_id=335294 http://www.thesamba.com/vw/forum/album_page.php?pic_id=335297
Back to top
View user's profile Send private message Gallery Classifieds Feedback
messenger123
Samba Member


Joined: July 19, 2025
Posts: 49
Location: IA
messenger123 is offline 

PostPosted: Tue Dec 16, 2025 12:44 pm    Post subject: Re: Gas Drip at Mounting Flange on 30/31 Solex Reply with quote

If you don't find any internal leaks, pull the carb and check both mating surfaces with a straight edge; they both need to be flat.
Back to top
View user's profile Send private message Gallery Classifieds Feedback
Bobs67vwagen
Samba Member


Joined: March 27, 2005
Posts: 936
Location: Eastern north carolina
Bobs67vwagen is offline 

PostPosted: Tue Dec 16, 2025 3:43 pm    Post subject: Re: Gas Drip at Mounting Flange on 30/31 Solex Reply with quote

If the carb float bowl is overfilling it will leak down there. 2 probable causes are faulty float shutoff valve in top half of carb, they get gummed up and stick, and or excessive fuel pump pressure.
Back to top
View user's profile Send private message Gallery Classifieds Feedback
my3bugs
Samba Member


Joined: June 18, 2003
Posts: 956
Location: Moreno Valley
my3bugs is offline 

PostPosted: Tue Dec 16, 2025 3:51 pm    Post subject: Re: Gas Drip at Mounting Flange on 30/31 Solex Reply with quote

i had a similar looking drip/leak there so i snugged that nut some . a while later i went for a 2 hour drive there n back n see the same thing , so i snugged that nut again thinking it was somehow coming loose . it wasent exactly running right either as it was sucking air in right there making it run lean .

it wasent coming loose , i was pulling the stud out of the carb . at first i added new threads to the carb n JB welded the stud in and it held long enough till i found another carb to rebuild .... may not be your problem . but it fixed mine issue .

have you tried to snugg the carb mounting bolts ?


Last edited by my3bugs on Tue Dec 16, 2025 3:58 pm; edited 1 time in total
Back to top
View user's profile Send private message Send e-mail Gallery Classifieds Feedback
KTPhil Premium Member
Samba Member


Joined: April 06, 2006
Posts: 36358
Location: Conejo Valley, CA
KTPhil is offline 

PostPosted: Tue Dec 16, 2025 3:57 pm    Post subject: Re: Gas Drip at Mounting Flange on 30/31 Solex Reply with quote

messenger123 wrote:
If you don't find any internal leaks, pull the carb and check both mating surfaces with a straight edge; they both need to be flat.


I would do this and ditch the throttle positioner gizmo and plate. It's just more possibilities for leaks like you have.
_________________
Current Fleet:
- '71 Fastback
- '69 Westfalia
Retired:
- '67 Beetle
- '65 Beetle (x2)
- '65 Bus
- '71 Squareback
Back to top
View user's profile Send private message Gallery Classifieds Feedback
Cusser
Samba Member


Joined: October 02, 2006
Posts: 33479
Location: Hot Arizona
Cusser is offline 

PostPosted: Tue Dec 16, 2025 5:56 pm    Post subject: Re: Gas Drip at Mounting Flange on 30/31 Solex Reply with quote

my3bugs wrote:
i had a similar looking drip/leak there so i snugged that nut some . a while later i went for a 2 hour drive there n back n see the same thing , so i snugged that nut again thinking it was somehow coming loose .

it wasent coming loose , i was pulling the stud out of the carb .

I had this happen like 40-45 years ago; I used a larger SAE stud and nut (drilled the hole in the manifold a tad).
_________________
1970 VW (owned since 1972) and 1971 VW Convertible (owned since 1976), second owner of each. The '71 now has the 1835 engine, swapped from the '70. Second owner of each. 1988 Mazda B2200 truck, 1998 Frontier, 2014 Yukon, 2004 Frontier King Cab. All manual transmission except for the Yukon. http://www.thesamba.com/vw/forum/album_page.php?pic_id=335294 http://www.thesamba.com/vw/forum/album_page.php?pic_id=335297
Back to top
View user's profile Send private message Gallery Classifieds Feedback
gt1953
Samba Member


Joined: May 08, 2002
Posts: 13959
Location: White Mountains Arizona
gt1953 is offline 

PostPosted: Tue Dec 16, 2025 8:24 pm    Post subject: Re: Gas Drip at Mounting Flange on 30/31 Solex Reply with quote

suggets you add this to the fle pump it keeps that pin in and fule pumping


Image may have been reduced in size. Click image to view fullscreen.

_________________
Volkswagen: We tune what we drive.
Numbers Matching VW's are getting harder to find. Source out the most Stock vehicle and keep that way. You will be glad you did.

72 type 1
72 Squareback
({59 Euro bug, 62, 63, 67, 68, 69, 73 type ones 68 & 69 type two, 68 Ghia all sold})
Back to top
View user's profile Send private message Gallery Classifieds Feedback
AR
Samba Member


Joined: September 10, 2025
Posts: 23
Location: Southern California
AR is offline 

PostPosted: Fri Dec 19, 2025 10:19 pm    Post subject: Re: Gas Drip at Mounting Flange on 30/31 Solex Reply with quote

Thanks everyone for your comments. I ended up replacing the mounting gaskets and it stop the gas leak. Having the emission control bracket sandwiched between two gaskets does lend to a leak problem.
I am considering removing the emissions like it was suggested to reduce problems down the line. I guess I was trying to keep everything period correct.
Back to top
View user's profile Send private message Gallery Classifieds Feedback
scrivyscriv
Samba Electrician


Joined: October 04, 2011
Posts: 3376
Location: Memphis
scrivyscriv is offline 

PostPosted: Sat Dec 20, 2025 10:53 pm    Post subject: Re: Gas Drip at Mounting Flange on 30/31 Solex Reply with quote

leaking gaskets there will show a symptom and not a cause. The carburetor shouldn't leak or drip, or otherwise discharge fuel after shutdown. Sometimes they do.. but they're not meant to. Float too high can cause it, or fuel pump PSI too high - or even the often-diagnosed, but usually not the problem, vapor lock related heat forcing fuel past the needle.
_________________
Robert in Memphis
Dünkelgrügen 1967 Java Green bug thread
Engine rebuild thread
If you're ever in the Memphis area, you are welcome to stop by for advice and help.
Back to top
View user's profile Send private message Visit poster's website Gallery Classifieds Feedback
Bobs67vwagen
Samba Member


Joined: March 27, 2005
Posts: 936
Location: Eastern north carolina
Bobs67vwagen is offline 

PostPosted: Yesterday 5:09 am    Post subject: Re: Gas Drip at Mounting Flange on 30/31 Solex Reply with quote

As Robert said above keep an eye on how it's running as there should not be late amounts of liquid gas down there. As said before it could be a float or fuel pressure problem.
Back to top
View user's profile Send private message Gallery Classifieds Feedback
Display posts from previous:   
Reply to topic    Forum Index -> Beetle - Late Model/Super - 1968-up All times are Mountain Standard Time/Pacific Daylight Savings Time
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum

About | Help! | Advertise | Donate | Premium Membership | Privacy/Terms of Use | Contact Us | Site Map
Copyright © 1996-2025, Everett Barnes. All Rights Reserved.
Not affiliated with or sponsored by Volkswagen of America | Forum powered by phpBB
Links to eBay or other vendor sites may be affiliate links where the site receives compensation.