Where is the one-way check valve on evap system?

The one-way check valve in the evaporative (evap) system is typically located in the fuel vapor line, often near the fuel tank or fuel filler neck. Its primary function is to prevent fuel vapors from escaping the system while allowing them to flow toward the engine for combustion. In some vehicle models, it may also be found in the charcoal canister assembly. It's important for maintaining the integrity of the evap system and ensuring proper emissions control.