A 6.9 or 7.3 IDI (not sure which one is in the truck) isn't exactly a "modern" Diesel They are great engines, just not very modern compared to what we have now.
Jacob You said you added a vac pump to operate the brakes with the engine off? Where did your brakes get vacuum before you added the pump? certainly not from the engine....
As for reduced pumping losses due to not having a throttle plate keep in mind the diesel's high compression ratio and heavy duty rotating assembly compared to gassers.
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