When the purge valve opens, the fuel vapors can access the intake manifold. How Does a Vapor Canister Purge Valve Work? Older vehicles use vacuum operated purge valves while newer vehicles used electronically operated ones. The purge valve lies within the vacuum line to allow these vapors into the intake manifold at the appropriate time. There is a vacuum line that connects the intake manifold with the charcoal canister that contains the fuel vapors.
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