[Cliff R]

At light engine load with the throttle plates nearly closed a good portion of the fuel to the engine comes from the idle mixture screw holes and off idle transfer slots. Large bore carburetors with small boosters rely on this more than smaller bore carbs with more booster area, like the TQ and Quadrajet.

The accl pump is NOT a player in that range, it is only there to cover up a momentary potential lean condition going QUICKLY to heavy or full throttle, or any really quick throttle movements. If you are "easing" into the throttle and seeing a lean spot, surging, hesitation, stumble, bog or just "flat" and not picking up speed as quickly as it should, you need to add fuel to the idle system more times than not.

As far as accl pumps go, the lip seal type pumps are not nearly as effective or desirable as those that use a garter spring to keep the pump cup in constant contact with the bore. I still see those older accl pumps showing up in rebuild kits for Q-jets and they don't make the grade, plus the "blue" or "black" seal on them is a complete POS and will not hold up in this new fuel. I have tens of thousands of "blue" seals removed from accl pumps to install a good one if anyone wants any samples to test PM me and pay the shipping and you'll have a small bag of them at your door in 2-3 days.......Cliff