Leaking Gas line @ carburetor

I

IndyA

Member
Friends: Installed a rebuilt carb in my'29 coup; tightened the hex compression nut (new ferrule) down to two threads showing and get a very small leak (about a teaspoon every 24 hrs). Am afraid to tighten the compression nut further for fear of stripping the carb threads. Snyders sells an oversize ferrule which might be one cure? Is there a common "paste" that can be applied to the forward-end of the ferrule to help make a perfect gas-tight connection? Many Thanks for your help.

IndyA
 
I have used Indian shellac. also try and tighten a little more ensuring the gas line is not pushed in to far.Also have seen where the ferrule has a hair line crack .
 
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Had same problem.. fixed by a few turns of plumbers tape/ thread seal tape on the line just behind the ferrule and tighten as per usual. Job done.
 
I had a similar problem at the sediment bowl, right before the extended ferrule was available. So I took the gas line off, blew all the gas out of it and let it lay in the sun for a short while until I was sure all the gas was gone from it. Then I put a light coating of solder on the face of the ferrule to build it out, making sure it was a uniform coating. I polished it with some very fine sandpaper (the black 3M type). That was over a year ago and I have a nice leak free joint and the hex of the compression fitting is slightly further away from the sediment bowl and does not bottom out.
 
Along the line of the solder suggestion that Bud made... I will sweat solder the ferrule to the tube before assembly. That seems to improve sealing and it requires less torque on the fitting to give a good seal.

Joe B
 
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