No need at this point to pull the heads. Just pull the valve covers and check the pushrods on the injectors. If one is bent it will be loose. One stuck injector holds al the racks to zero on these motors, as opposed to the runaway situation you get with other jimmys.
To operate the high idle, you have to have the truck running and in neutral, and flip the switch beside the PTO knob. That will kick it in to 1200 rpm. If you shift the tranny, or turn of the master, the rpm will drop back down to idle.
For fuel line just use hydraulic hose with reusable fittings. That will outlast you. Just check as not all hydraulic hose is recommended for diesel. But if you go to a hose place, you won't be the first guy to go there looking for this purpose.
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