Fumes

[ryanheacox]

Those old carbs do like to leak when given the chance. If you're up for it, it's relatively easy and cheap to rebuild the carburetor and be confident that it will perform well and be leak free. There are a ton of articles about rebuilding them too.


Can you pinpoint where it's leaking from? Is the throat of the carb wet or is it just the bottom?

[Apperloo]

Thanks eh
24 hrs and the sediment bowl is 1/2 full.
I cleaned up around the carb this morning, and all is still dried up.
It was wet on the bottom.
I have a new gas valve to install, so will change that first, and if all goes well and the leaking stops, it will be onto the next issue

[History]

These carburetors are pretty simple if you're mechanically inclined. I'm glad I accepted the challenge of rebuilding mine. Of course I haven't ran the engine since then but I'm confident it's done correctly. I'm sure there's fellows who could fine tune to perfection and I'll admit I'm not one of them.

If you just need a gasket or a complete rebuild, I say go for it. Lots of information on this site.

If you do rebuild yours make sure you are carful when you separate the halves as the Venturi can become stuck in either or both sides. Mine was broken in two pieces and had been used that way as one side was sanded smooth at the break.

[Apperloo]

It’s been a fair number of years, too many, since I’ve rebuilt a Holley double or carter carb, but I will tackle whatever needs doing, at least once
Any thoughts on using Teflon tape or "?? on the pipe thread end of the gas valve threading into the tank? I suspect stock did not use any sealant ....

[30 Closed Cab PU]

Originally Posted by Apperloo

It’s been a fair number of years, too many, since I’ve rebuilt a Holley double or carter carb, but I will tackle whatever needs doing, at least once
Any thoughts on using Teflon tape or "?? on the pipe thread end of the gas valve threading into the tank? I suspect stock did not use any sealant ....

If using Teflon tape, use the gas/oil resistant type. I believe it is yellow. Not commonly found, may have to search for it. When wrapping it on the shutoff threads make sure the tape does not extend past the threads, which can cause the tape to shred and get into the gas supply.

[30 Closed Cab PU]

Sponsored Links (Register now to hide all advertisements)

Here is links on Zenith carbs. Everythings you wanted to know, and maybe more than you want to know.
https://www.modela.org/


Les Andrews books, and the Rex Reheis Way written by Gordon Biggs are also excellent books.

[Apperloo]

[QUOTE=30 Closed Cab PU;1790260]Here is links on Zenith carbs. Everythings you wanted to know, and maybe more than you want to know.
https://www.modela.org/

Great , that is a lot info for a simple system. Saved to my dropbox. Thanks

[Synchro909]

To seal any thread, I use a small dab of Permatex No 3 Aviation gasket sealer. Fuel and oil don't affect it and the thread can be undone easily later. I use it on the sump and gearbox plugs, fuel lines, diff housings - everywhere. Similar stuff was around when I was a kid so it has stood the test of time.
Clean up is with a little mineral turps on a rag.
No more leaky joints anywhere.

[Apperloo]

I let it drip last night and for sure it is seeping thru the area above the float.
The A has been pretty much sitting for 20 years, so I’m sure that gasket has gone bad.
In the job jar

[ryanheacox]

I recently changed all the gaskets in mine and put in a viton tipped float valve. No more leaks for me.

[30 Closed Cab PU]

Originally Posted by Apperloo

I let it drip last night and for sure it is seeping thru the area above the float.
The A has been pretty much sitting for 20 years, so I’m sure that gasket has gone bad.
In the job jar

If you are referring to the gasket that is between the bowl and the upper carb body, if the float valve is set and working properly gas does not reach that high in the float bowl, even with a bad gasket it should not have a leak.

[Apperloo]

Originally Posted by 30 Closed Cab PU

If you are referring to the gasket that is between the bowl and the upper carb body, if the float valve is set and working properly gas does not reach that high in the float bowl, even with a bad gasket it should not have a leak.

Thanks, I will check that