The evap system †short for evaporative emission control system †is designed to prevent gasoline vapors from escaping into the atmosphere. Your fuel tank and fuel system naturally emit vapors, … The evap system is responsible for capturing fuel vapors produced in your vehicle's fuel system, storing them in a charcoal canister, and safely burning them off in the engine.

The evaporative emission control (evap) system captures gasoline fumes and other emissions produced when fuel evaporates within the gas tank or fuel system. The evap system then returns …