1) I have been advised, by Carbking himself (at least that’s how I remember it), that modern fuel tends to “wick” its way up carb castings….up and out of vent holes. You will see the tiniest drop of fuel on my YF long after the truck has been shut down. Not much I can do about that.
I share that to indicate what you are seeing may not NECESSARILY be a leak at the fitting.
2) That said, it is NOT normal for that particular fitting to bottom out. Pipe thread seals at the taper and bottoming out prevents that. I suspect you know that.
I’d suggest finding another fitting, of any kind, that is known to be 1/8 MNPT. Try it in the same hole and see what happens. That particular hole should accept a 1/8 pipe fitting. But it’s hard to say what has happened to that carb in the last many decades. Perhaps someone tapped it for something different? Perhaps it was a factory defect?
I am unfamiliar if the process of re-tapping or helicoiling a carb body. Pretty soft material. I’d assume it can be done but I can’t speak from any sort of experience.
Last edited by JW51; 12/12/2023 5:36 PM.
