Turning a diesel pump down affects ONLY the maximum power that can be produced by the engine. At less than wide open throttle it affects nothing - including fuel economy.
On your truck you can accomplish the same thing as "turning down the pump" simply by sticking a piece of wood under the accelerator pedal so it can't go all the way to the floor.
And turning the pump down on your tractor will simply cause it to lug more under load and feel generally sluggish. It won't help fuel economy a bit. It may also make it more difficult to start as others point out.
Also forget about restricting the inlet air. This simply makes the engine work harder and smoke more - and increases fuel consumption. (It's the same as running a diesel with a very dirty air cleaner...)
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Today's Featured Article - A Tractor's Point of View - by John Manley. I began my life on August 3,1941. I was actually built at different times and days but I was officially an M Farmall on August 3.I was real nice and shiny. That�s me, in the old picture, third from the left. I was loaded on that train and sent to a little town in South Carolina. I didn�t get to see much of that town. I was moved off the train fast and on to the dealer�s
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