One symptom of the oil pressure switch providing FP power is a long crank to start, because the engine has to build oil pressure to power the pump. Another symptom might be what you are explaining. At hot idle the oil pressure might be dropping just enough to open/close the contracts powering the pump. If this confirms what is wrong, your engine might have really low oil pressure at idle, or hopefully the oil pressure switch is failing too since I think it only takes 4-7 psi to power the pump.
If it's still there, there's a plastic cover on the pass firewall (above valve cover). Under the cover is the fuel pump relay. There is also a single wire connector right at the fuel pump relay harness that you can supply 12v for fuel pump testing, I think the wire is red. That bus bar to the left of the relay is a good power source for a jumper wire.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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