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 - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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