Answer :
Final answer:
The canister vent solenoid in Ford EVAP systems is normally closed, preventing outside air from entering the canister under normal conditions. It opens to vent fuel vapors when necessary, controlled by the engine's computer. Thus, the correct choice is that it is normally closed.
Explanation:
Understanding the Canister Vent Solenoid in Ford EVAP Systems
The canister vent solenoid in a Ford EVAP (Evaporative Emission Control System) is critical for managing fuel vapor.
Specifically, the canister vent solenoid is normally closed. This means that under normal operating conditions, the solenoid prevents outside air from entering the canister. It opens when commanded by the vehicle's engine control unit to allow the canister to vent fuel vapors during specific engine conditions, such as during fuel filling or certain driving conditions.
To clarify the options presented:
- Normally open: This would imply that the valve allows air into the system at all times, which is incorrect.
- Never seated: This option is not relevant, as the solenoid does operate to seal off the system when closed.
- Normally closed: This is the correct response, as it accurately describes the typical state of the canister vent solenoid.
- Not vented to outside air: Although valid in its context, it does not directly indicate whether the solenoid is normally open or closed.
Therefore, the correct answer to the question is that the canister vent solenoid is normally closed.
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