"So, if I loosen the inspection cover it will relieve the pressure and it should stay running, pointing to needing the injector pump rebuilt?"
Yes, if it the common "JDB" pump, NOT sure if they used anything else during production, but that's all I saw in a QUICK look at the parts manual.
If it DOES run with the cover a little loose, pointing to a restricted fuel return system, BEFORE condemning the pump, make SURE the fuel return system is "open" all the way from the IP to the fuel tanks, as a restriction ANYWHERE in that line will cause the engine to shut down... could be as simple as a line that has gotten damaged/squashed.
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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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