Accelerator pump was a minor issue in gas engine carb design. Also - several farm tractors DO indeed have them. Some Deere (3010, 3020, 4010, 4020, 500) tractors had them. My IH farm and industrial tractors them (B275 and 3414).
A properly working accelerator pump prevents lag when you hit the gas pedal by making up for what would otherwise be a lean situation. That happens because there is a time-lag in the venturi system when the throttle is open. It does not "wash cylinders off" as you describe. Not when working as designed.
Most cars that I had any experience with - when they changed from carbs to throttle-body fuel injection - went down in MPGs, not UP. So if anything, more fuel went unburned with the first TBI systems.
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Today's Featured Article - A City Guy's First Tractor - by Fred Hambrecht. After living in apartments in Atlanta for more years than I care to remember, the wife and I decided to move to the country. Humming "Green Acres is the place for me..." we purchased a 29 acre tract about 60 miles south of Atlanta. Next came the house, I could talk about that ordeal for another two weeks... But, I want to talk about my tractor! We didn't even own a lawnmower, and all of a sudden we had enough grass to feed all the starving children of the bovine world. Naturally, I talked
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