The operating principle of float-type carburetors is based on the Bernoulli’s theorem which states that the energy per unit mass of a moving fluid is constant. As the air passes through the convergence of the Venturi duct, its velocity increases causing a drop in pressure and temperature. Knowing this, icing can form at any time even if the OAT is higher than +10°C if the air is humid enough, not only at freezing temperatures. The pressure will drop proportionally to the mass airflow and is used to make fuel flow from the float chamber by placing a ‘U’-shaped jet into the Venturi. Engine suction creates a difference in air pressure at the throat of the Venturi duct and the air inlet resulting in a sucking effect. Besides the drop in pressure and temperature at the Venturi’s throat, the later will increase again within the induction manifold as the throttle is opened.