EVAP Canister Purge Check Valve - Dual Path: Notes
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2011 Mercury Milan, 2011 Mercury Mariner, 2011 Mercury Grand Marquis, 2011 Lincoln Town Car, and 2011 Lincoln Navigator L. However, it is still accessible from the selected car via links, so may be relevant.
The EVAP canister purge check valve dual path is used to allow purge flow during boost conditions. Fuel vapors flow through the EVAP canister purge check valve to the intake air system upstream of the turbocharger before entering the intake manifold. When the engine is OFF, or at atmospheric pressure, the EVAP canister purge check valve is in an indeterminate state.