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Hi
I want to replace my leaking fuel line with a normal rubber tube and clamps -> I need to change nipple in the carburator. What size is that thread into carburator (I`m still not used to imperial threads). Is there a standard part for this?
What brand is the carburator by the way?
br
Marcus

Most likely 1/8" pipe thread

Yes, what I am showing for the 67218 used here on the two piece flo jet is 1/8-27 NPT. The connector here just has threading on both ends instead of the barbed end here.

The engine I looked here with similar carburetor was 171437-0530.

There is a "hose barb" inside the old fuel hose. All you need to do is grind off the 6-sided fuel line crimp, and the old brass barb will pull out of the old fuel hose. Then you can use the old barb and male-to-male thread adapter knowing they are the correct thread. And you won't need to buy anything but the new fuel hose.

Be sure your new hose is marked "SAE J30" or it won't stand up to new ethanol laden fuels.

Hope this helps.

I think this is what you are looking for. Take your coupler to your local auto parts store, they should have them in stock.