What causes fuel evaporation ice in an induction system?

Fuel evaporation ice in an induction system is caused by the cooling effect that occurs when fuel is introduced into the airstream, particularly when the temperature of the air is already low. When fuel vaporizes, it absorbs heat from the surroundings, which decreases the temperature of the air-fuel mixture. If the air temperature is already low, this drop in temperature can lead to the formation of ice, commonly referred to as fuel evaporation ice.

This phenomenon is especially significant during certain conditions, such as when the engine is operating at high power settings or in humid environments. The introduction of the fuel changes the ambient conditions in the induction system, potentially leading to ice formation if the temperatures fall below freezing.