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 - Tractor Profile: Allis-Chalmers Model G - by Staff. The first Allis-Chalmers Model G was produced in 1948 in Gasden, Alabama, and was designed for vegetable gardeners, small farms and landscape businesses. It is a small compact tractor that came with a complete line of implements especially tailored for its unique design. It featured a rear-mounted Continental N62 four-cylinder engine with a 2-3/8 x 3-1/2 inch bore and stroke. The rear-mounted engine provided traction for the rear wheels while at the same time gave the tractor operator a gre
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