AFB accelerator pump not pumping with engine running...Argh! in Buick - Post War Posted November 20, 2012 Hey David, The car's idling and running great, but there's no pump shot with it running. It does have a leather pump, and I've tried two of them. I tested the floats this past summer by holding them underwater when I went through the carb. I didn't notice the bog so much when it was warmer out, but now that it's chilly, it's quite evident.