EVAP Dual Check Valve
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The EVAP dual check valve allows purge flow during boost conditions. Fuel vapors flow through the EVAP dual 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 dual check valve is in an indeterminate state.
There are 2 types of EVAP dual check valves on turbocharged engines. One type has the check valves integrated in a single housing assembly. The second type has separate check valves connected to a hose assembly with the EVAP ejector integrated with one of the check valves.
Typical EVAP Dual Check Valves
| Item | Number | Description |
|---|---|---|
| 1 | - | Purge Flow To The Intake Air Inlet System To The Turbocharger |
| 2 | - | Purge Flow From The EVAP Purge Valve |
| 3 | - | Purge Flow To The Intake Manifold |
Typical EVAP Dual Check Valve Assembly
| Item | Number | Description |
|---|---|---|
| 1 | - | Purge Flow To The Intake Air Inlet System To The Turbocharger From The Check Valve And EVAP Ejector |
| 2 | - | Purge Flow To The Intake Manifold |
| 3 | - | Turbocharger Boost Pressure From The Charge Air Cooler (CAC) |
| 4 | - | Purge Flow From The Fuel Tank |