The vacuum created in the venturi draws in fuel from the float chamber, which is at ambient pressure. The faster the filtered air comes in through the carburetor throat, the lower the pressure is ...

A low-pressure area is created while the fuel in the float chamber ... When picking a carburetor for the street, less cfm can be more. Resist the temptation to go too big as throttle response ...

FloatThe float maintains a constant level of fuel in the float bowl, and while it seems to be a simple system, it has to function correctly to maintain the proper air/fuel ratio. If the fuel level ...

the higher atmospheric pressure in the float chamber pushes fuel toward the low-pressure area in the venturi. Contrary to popular belief, a carburetor does not suck fuel into a venturi.