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In the 2015 Ford Fusion, the vapor canister purge valve is positioned above the rear muffler on the evap canister that is linked to your fuel tank. Its main function is to release excess pressure from the fuel tank to prevent vapor lock and fume leaks. If the purge valve malfunctions by getting stuck open, a check engine light will typically indicate a significant vacuum leak. Conversely, if it becomes stuck closed, a warning light may signal high pressures in the system. In the event that the purge valve breaks, it will need to be replaced, a task that typically costs around $100 if done by a repair shop due to its accessibility.
The purge valve can be found in the vacuum line that connects the fuel vapor containment canister to the intake manifold.