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 Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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