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 - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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