QuestionJune 25, 2025

The EVAP Purge Valve: A) Performs the EVAP check monitor. B) Is used by turbocharged engines to generate vacuum for purge. C) Is duty cycled so that fresh air is drawn in to purge stored vapors. D) Stores fuel vapors until they can be consumed by the engine during combustion.

The EVAP Purge Valve: A) Performs the EVAP check monitor. B) Is used by turbocharged engines to generate vacuum for purge. C) Is duty cycled so that fresh air is drawn in to purge stored vapors. D) Stores fuel vapors until they can be consumed by the engine during combustion.
The EVAP Purge Valve: A) Performs the EVAP check monitor. B) Is used by turbocharged engines to generate vacuum for purge. C) Is duty cycled so that fresh air is drawn in to purge stored vapors. D) Stores fuel vapors until they can be consumed by the engine during combustion.

Solution
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Answer

C) Is duty cycled so that fresh air is drawn in to purge stored vapors. Explanation 1. Understand the Function of the EVAP Purge Valve The EVAP (Evaporative Emission Control) purge valve is a component in the vehicle's emission control system. Its primary function is to control the flow of fuel vapors from the charcoal canister to the engine intake manifold, where they are burned during combustion. This helps reduce emissions by ensuring that fuel vapors do not escape into the atmosphere. 2. Evaluate Each Option - **Option A**: "Performs the EVAP check monitor." This is incorrect because the EVAP check monitor is a diagnostic process, not a function of the purge valve itself. - **Option B**: "Is used by turbocharged engines to generate vacuum for purge." This is incorrect because the purge valve does not generate vacuum; it uses the existing vacuum from the engine. - **Option C**: "Is duty cycled so that fresh air is drawn in to purge stored vapors." This is correct. The purge valve is indeed duty-cycled (opened and closed at intervals) to allow fresh air to enter the system and help draw out stored vapors from the canister to the engine. - **Option D**: "Stores fuel vapors until they can be consumed by the engine during combustion." This is incorrect because storing vapors is the function of the charcoal canister, not the purge valve.

Explanation

1. Understand the Function of the EVAP Purge Valve<br /> The EVAP (Evaporative Emission Control) purge valve is a component in the vehicle's emission control system. Its primary function is to control the flow of fuel vapors from the charcoal canister to the engine intake manifold, where they are burned during combustion. This helps reduce emissions by ensuring that fuel vapors do not escape into the atmosphere.<br /><br />2. Evaluate Each Option<br /> - **Option A**: "Performs the EVAP check monitor." This is incorrect because the EVAP check monitor is a diagnostic process, not a function of the purge valve itself.<br /> - **Option B**: "Is used by turbocharged engines to generate vacuum for purge." This is incorrect because the purge valve does not generate vacuum; it uses the existing vacuum from the engine.<br /> - **Option C**: "Is duty cycled so that fresh air is drawn in to purge stored vapors." This is correct. The purge valve is indeed duty-cycled (opened and closed at intervals) to allow fresh air to enter the system and help draw out stored vapors from the canister to the engine.<br /> - **Option D**: "Stores fuel vapors until they can be consumed by the engine during combustion." This is incorrect because storing vapors is the function of the charcoal canister, not the purge valve.
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