Float-type carburetors

As the level of fuel in the float bowl drops, the hinged float falls away from the inlet needle. Fuel flows past the needle and into the bowl at a much higher rate than the engine can use. The level in the bowl rises, lifting the float and forcing the needle against its seat. The [...]

Float carburetors give more precise control over the mixture than diaphragm types and cost no more to manufacture. But float mechanisms are gravitysensitive and cease to be reliable at angles of 30° off the horizontal. Consequently, their use is limited to motorbikes, snowmobiles, outboard motors, and other applications that, hopefully, stay upright. small engine float,small [...]