5/16 in line fuel check valve

when I took the top of the carb it was almost dry no fuel in the pump well.
Just seems like it should not take so much time to pump up fuel, somethings not right.

Actually if the bowl is empty, 10- 15 seconds with the engine turning at 60 rpm sounds about right.
I think its odd the bowl is almost empty. Should be at least half full even if all of the light stuff evaporated and escaped out the vent.