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CT Jack · 10-09-2022, 08:54 AM

The ferrule on the end of the tube should located approximately 3mm in from the end of the tube and should not have any deep scratches or distorted. Replace the ferrule if it is damaged. If the compression nut and ferrule are in good condition you should not need to use tape on the threads. If the leaking continues after proper tightening I would check the carburetor casting around the threaded port for cracks. Someone might have over tightened the nut or damaged the threads. If you find any sign of damage I would install the Zenith which is made of cast iron and was the original Model A carburetor .
I see you have the incoming gas line coiled. I would not keep this arrangement as it might cause vapor lock of the incoming fuel. The longer distance would allow the fuel temperature to increase before entering the carburetor. The line should be just long enough to properly make the connection.

10-09-2022, 08:54 AM	#3
CT Jack Senior Member Join Date: May 2010 Location: Hebron, CT Posts: 537	Re: Tillotson leaking fuel The ferrule on the end of the tube should located approximately 3mm in from the end of the tube and should not have any deep scratches or distorted. Replace the ferrule if it is damaged. If the compression nut and ferrule are in good condition you should not need to use tape on the threads. If the leaking continues after proper tightening I would check the carburetor casting around the threaded port for cracks. Someone might have over tightened the nut or damaged the threads. If you find any sign of damage I would install the Zenith which is made of cast iron and was the original Model A carburetor . I see you have the incoming gas line coiled. I would not keep this arrangement as it might cause vapor lock of the incoming fuel. The longer distance would allow the fuel temperature to increase before entering the carburetor. The line should be just long enough to properly make the connection.