Actually, the IH updraft carburetors on H's and M's do have a form of accelerator pump. The air bleed circuit continually bleeds air into the fuel just past the main fuel jet, creating little bubbles in the fuel standpipe. When you snap the throttle open the increase of vacuum on the air cleaner side of the throttle sees suddenly increased vacuum and those little air bubbles in the standpipe explode and push the fuel in the standpipe into the air stream. A no-moving-parts accelerator pump. Just like the no-moving-parts fuel pump on the letter series.
Tractors with the air circuit (through the valve at the end of the throttle plate shaft) plugged or not adjusted right will always stumble upon sudden throttle opening but will do fine on slowly increasing throttle position.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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