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HELP please my carb is filling with gas and i dont know why?
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asesapie
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PostPosted: Tue Nov 11, 2014 6:10 pm    Post subject: Reply with quote

See my post above before this post.

Okay so the setup I'm running is CB Performance weber 34 ICT's, 009 and Mr. gasket electric fuel pump. So I rebuilt the carbs about 1.5 months ago and the square has run great till it started showing the same issue it's had before with the carbs leaking.

I just checked the spark plugs on the 1/2 side and the are soaked with gas cause the 1/2 side carb looks like it is still seeping fuel. The inside of the carb looks wet when looking down the throat. It was also wet around the gasket and spacer where It bolts up to the manifold.

Ideas?
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Mike Fisher
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PostPosted: Wed Nov 12, 2014 6:49 am    Post subject: Reply with quote

Slow 1200 says his carburetors were dripping gas because his fuel pump was too strong. What pressure does your Mr.Gasket fuel pump put out?
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asesapie
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PostPosted: Wed Nov 12, 2014 8:05 am    Post subject: Reply with quote

I tested my pump pushing 3.75 PSI. The fuel leaking isn't only happening when running though. It is also happening after running. It also seams to be isolated to the 1/2 side only. I really just want my square to be a reliable daily without worrying about the fuel ruining the oil and causing bad lubrication in the motor.
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Mike Fisher
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PostPosted: Wed Nov 12, 2014 8:13 am    Post subject: Reply with quote

I never had any trouble with my Solex's leaking gas. 3.75 PSI is too much I believe for carburetors. Adjust it down to 2.75 PSI.
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ataraxia
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PostPosted: Wed Nov 12, 2014 8:41 am    Post subject: Reply with quote

I would try using a mechanical fuel pump if adjusting the electric pump pressure down below 3psi and changing out the needle seats doesn't solve the issue.

The new needle seats are notorious for leaking which is why the old ones are typically retained/used.
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asesapie
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PostPosted: Wed Nov 12, 2014 10:08 am    Post subject: Reply with quote

How do I go about adjusting the pressure of the electric pump? Would I need a pressure regulator inline?

I've changed out the needle seat valves 3 times so far with them lasting what seems to be a few months. They to me would be the same thing in the carb when built so they should be of good quality you would hope.

I also came out to the square this morning with fuel leaking out of the muffler, sounds like the needle valve on the 1/2 side is shot as the 3/4 side is working just fine.

I may call CB Performance and get there input on the situation as it has been off an on for quite some time now.

Thanks for the responses again guys.
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W1K1
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PostPosted: Wed Nov 12, 2014 10:22 am    Post subject: Reply with quote

http://vwparts.aircooled.net/Fuel-Pressure-Regulat...ulator.htm
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asesapie
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PostPosted: Wed Nov 12, 2014 12:52 pm    Post subject: Reply with quote

Thanks for the suggestion on the fuel pressure regulator. I will pick one up.

In regards to the fuel consistently leaking through the 1/2 side carb, needle seat valve again? I just replaced it about 1 month ago or so. I can't see the needle valves being that poor in quality.
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asesapie
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PostPosted: Wed Nov 12, 2014 3:26 pm    Post subject: Reply with quote

got a hold of CB Performance and they gave me some measurements for setting the floats in the carbs to help resolve the issue. They also suggested the fuel pressure regulator which thank you for the suggestion as well. I will be getting one shortly.

Hopefully I'll be able to get to this soon to get the square back up and running.


Fuel pressure regulator ordered. Hope to have it before the weekend.
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haz77
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PostPosted: Fri Nov 14, 2014 8:31 am    Post subject: Reply with quote

I read on a post about the after run flooding issue with Empi 34 carbs that you need / can run the fuel as low a 2psi to prevent this.

Also why not fit the thermal insulation gaskets between both the head/manifold & the Manifold/carbs if residual heat transfer is the issue?
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Erik G
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PostPosted: Fri Nov 14, 2014 8:58 am    Post subject: Reply with quote

haz77 wrote:
Also why not fit the thermal insulation gaskets between both the head/manifold & the Manifold/carbs if residual heat transfer is the issue?


that would make your set up both wider and taller, causing issues with linkage and engine lid. I've lived in hot and cold environments, and I've never needed them.
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Bobnotch
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PostPosted: Fri Nov 14, 2014 12:05 pm    Post subject: Reply with quote

Erik G wrote:
haz77 wrote:
Also why not fit the thermal insulation gaskets between both the head/manifold & the Manifold/carbs if residual heat transfer is the issue?


that would make your set up both wider and taller, causing issues with linkage and engine lid. I've lived in hot and cold environments, and I've never needed them.


Yup, with the CB set up, I've never needed them either. I just make sure I use the thick paper gasket (supplied) at the manifold to head connection, rather than the steel gasket normally used on bugs.

Now, on Solex carbs, I do use the phenolic spacer, between the carb and the manifold, as it does help (plus with Solex carbs you have air cleaner room). Wink
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asesapie
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PostPosted: Sat Nov 15, 2014 7:46 pm    Post subject: Reply with quote

I am running phenolic spacers under my carbs. So I adjusted the fuel floats on both carbs based off the info CB Performance gave me and the left carb as usual is working great. However the right side carb that has always had issues still seems to seap fuel while running or off. Basically looking down the carb throats the left side looks to be dry and running great when at idle. The right side though looks wet all the time.

I am running a fuel pressure regulator now as well and have the PSI set at 3.

I believe there has to be something defective in this carb as it has always been an issue.
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W1K1
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PostPosted: Sat Nov 15, 2014 7:52 pm    Post subject: Reply with quote

Try turning it down to 2 psi, i have seen them leak at 3 and 2.5 psi
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asesapie
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PostPosted: Sat Nov 15, 2014 9:10 pm    Post subject: Reply with quote

If it was the fuel pressure causing the issue wouldn't you think it would leak/seep on both carbs not just the one?

I'll give it a shot but I'm not expecting much.
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W1K1
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PostPosted: Sun Nov 16, 2014 6:22 am    Post subject: Reply with quote

We had the same issue with a set of rebuilt solex, it was pissing out of the left carb, we changed valves, checked floats, jets, etc, and as soon as it got 2 psi it ran just great with no bleeding.
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PostPosted: Sun Nov 16, 2014 11:29 am    Post subject: Reply with quote

asesapie wrote:

I believe there has to be something defective in this carb as it has always been an issue.


I agree. You've been having issues with that 1 carb since day 1, and I don't know IF you'll ever get it right, short of taking it to someone who specialises in them.
It might be a case of having to replace it, if dropping the fuel pressure doesn't help. Like I said before, I haven't really ever had an issue with the CB ICTs, but the empi version yes, as they're not built with the same quality. And yes, I've had issues in the past with Solex carbs after rebuilding them (same issue you're currently dealing with).
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Nate M.
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PostPosted: Mon Nov 17, 2014 9:28 am    Post subject: Reply with quote

ensure that the float bowl vent is clear and not blocked. If there's no way for the air on top of the fuel to vent, the float can't rise and the carb pisses fuel endlessly.

Mud dobber wasps cause this a lot. . .
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asesapie
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PostPosted: Mon Nov 17, 2014 5:07 pm    Post subject: Reply with quote

Okay so I have been using the Mr.Gasket fuel pressure regulator and it sucks. It won't adjust past 3.25 psi. I did receive the fuel pressure regulator in the link earlier.
http://vwparts.aircooled.net/Fuel-Pressure-Regulat...ulator.htm

How do I adjust this fuel pressure regulator? It didn't come with any instructions. I want to try this regulator out to lower the pressure below 3 psi.

My ICT's are from CB Performance not the knock off Empi's.

Where is this vent hole that shouldn't be blocked??
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asesapie
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PostPosted: Tue Nov 18, 2014 4:10 pm    Post subject: Reply with quote

Anyone on how to adjust the fuel pressure on above linked regulator?
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