"I always 'assumed' oil pumps just did their thing without a prime"
For everyday use they do. There are a couple occasions when priming is a good idea, however. When you shut off your engine, it merely stops pumping. The entire system doesn't drain. Oil is still in most of the parts, merely without pressure. After you rebuild an engine there is no iol anywhere in the system. Some people coat everything with something like STP to lubricate it for that short period that no oil is in the system. Often when I worked in the salvage yard, we would take an engine that had been upside down or such for a really long time. On many engines, we can remove the distributor and insert a modified shaft from another distributor and turn the pump to circulate oil thruough out the engine. Now really big engines used on stationary plants, Ships etc. have a detached LOP that is started before the engine, so when the engine starts it has oil pressure already.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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