Carter 2BBL carb- I am stuck

Ok, I see about the 2 minutes.
The accelerator pump does not rehydrate itself. It has checkvalves on both sides of the diaphragm; an inlet check and a discharge check. If yours is in fact self-priming, then the inlet checkvalve is not working.Normally this would cause a stumble, anytime the throttle is opened, from any position, as the pump would just push the fuel back into the bowl. I think its more likely that the fuel remained in the pump reservoir,overnight.

I got to thinking,and this came to me; If the suction-breaker at the top of the venturi-cluster were plugged, I think it might be possible for the fuel to siphon out through the low speed circuit,overnight . This would also deaden the response to the mixture-screw adjustments. It might also cause the engine to run rich,all the time.IIRC that cluster is just screwed on with 1 or 2 screws, and I seem to remember the suction breaker is the hollow screw itself.