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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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