why does my engine do this???

my car did that before i put a new carb on it. it leaked horribly. HORRIBLY. dont burn up your starter cranking it for that long, i know i did. put the pedal to the floor before you start cranking it, dont pat it (accelerator pump will flood it even worse if you do), the open butterfly(ies) will allow enough air in to get the gas out quicker.