Starting Problem

I have a 74 225 1-bbl. Im having trouble when the car sits for a day or more. It just runs for a second or two( runs off the fuel in the bowl) Then it won't start just turns over. It acts like the fuel drains back to the tank. If i spray carb cleaner in it it fires right up and runs long enough for the fuel pump to catch up. When i start it every day its fine, it also rund fine when warm. What can i do to stop this? Thanks alot.