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 - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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