Question for people who know something about cars

[38Chevy454]

But when you really 'punch it', as I recall, there was a little pump that would inject gas into the carb to give extra richness for acceleration. I think it was called a 'dashpot' mechanism? It wouldn't respond to a slow change in pedal position, only a fast pump. Now I recall, on a cold day, in addition to the choke, you might pump the gas pedal like that to get a richer mixture.

-ERD50

That is officially called the accelerator pump. Needed because when you open the throttle, it takes a bit for the carburetor to see the increased airflow. The extra fuel keeps it from going momentarily lean and stumbling.