where is the vent solenoid aka vent valve aka evap shut-off valve located

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got a car that won't pass the smog evap test, large gross leak, want to do a smoke test but i was told to close the vent solenoid, problem is i don't know where it is or what it looks like heard its called the vent valve, and unsure if its called the evap shut-off valve if you search up on google on how to close vent solenoid for evap test you will see the instructions