AC fuel pump connectors/fixing leakage.
(Image 1) shows another solution. The fibre (or copper) washer seals the joint. A parallel thread into the pump casting will not expand the female part, hence reuse is a better tolerated. The .405" (10mm) x 27 tpi thread does not exist commercially, but a nice job for the home shop machinist. By the way, the pump exit adaptor (image 2) has a 1/2 UNEF thread on the end that engages the olive nut. This is an extra fine UNF thread, also found on vintage motorcycles.
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