Re: Fuel line size ?
The same fuel line and fittings fit both Tillotson, Zenith and all of the other upodraft carbs made for the model A that I know of. The same fittings and ferrules also work with glass bowl sediment bowl , cast iron sediment bulb and the cast side bowl used with the 1931 models. I've used steel brake lines from local parts houses as well as copper tubing with never a problem. Problems with copper tubing is highly over rated.
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