High pressure pump? I think you are talking about the governor, aren't you?
That is for the high idle, which you engage when the crane is in operation. It takes the engine to 1200 rpm unless you turn off the power, or shift the transmission out of N.
It is very likely that you have a seized injector, which is common on these trucks if they sit for a while. Pull the valve covers, and look for a bent pushrod.
Good news is you can usually disassemble the injector and clean it up with a plastic scrub-bud.
You can straighten the pushrod, but you will have to use an injector setting dial gauge and set it to the specification listed on the decal of your valve cover. Hopefully the decal is still there and readable, otherwise you have to do the full base circle timing, which involves removing the head(s). Or, you can cheat and just set the injector in the ballpark to what the others are set at.
The 8.2 was not a great engine. We had injectors seizing even when the trucks were being initially delivered.
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