Thanks, Dave. I was so proud of myself, but at least I discovered the answer...not a bushing-like insulator stand-alone part, but a tube whose ID and OD meets spec, and then can be cut to the 3/4" length.
I haven't installed it yet, and the pump won't be here until Wednesday, so I'll do some tube shopping. But what material would have been used? It would almost be paper thin to work. Rubber tubing? (Modern: Nylon? Plastic?)
In the parts book, there's a listing for a Bail and Screw. The mounting screws aren't illustrated. Is a bail an insulator? In jewelry, a bail holds/retains a gem. Anyway there's no clue on specs here because the references are to AC part numbers.
In the double action pump illustration, I can see how the fuel component is pretty well sealed off and why, perhaps, gas it wasn't spewing fuel when it broke in half. But it also shows how it might have leaked oil from the engine from the rocker arm opening.
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