[Bob In Ct]

Just for the record - An accelerator pump (or two) is used because when the throttle plates are opened quickly, air (being far less dense than gasoline) immediately enters the manifold. The gasoline (being more dense than air) takes a while to catch up following the usual carburator plumbing. The accelerator pump provides the gas necessary during that lull.

Without an accelerator pump, acceleration, especially heavy acceleration, would be proceeded by a big hesitation.

Bob