Monthly Archives: April 2021

How does the Evaporative Emission System (EVAP) work?

How does the Evaporative Emission System (EVAP) work?

The Evaporative Emission System (EVAP) is designed to store and dispose of fuel vapors before they are released into the atmosphere. Not only does this help the environment, but it also helps fuel efficiency and keeps the gasoline smell out of your cabin. So basically, these systems are designed to store and dispose of fuel vapors. There are several types of EVAP systems, but the standard system is comprised of your fuel tank, gas cap, liquid-vapor, fuel tank pressure sensor, separator, evap canister, and series of tubes and valves. These parts work together to purge the harmful hydrocarbons. When the fuel evaporates inside your gas tank, the harmful vapors get moved to a charcoal canister stored at the front of your vehicle. When the fuel to air mixture becomes normal, it's transferred back to the engine. After this process, a valve makes a vacuum, drawing vapors into the engine. These vapors combine with fresh air from built-in vents and valves for more efficient combustion. Th ... read more