Glossary / Engine

purge valve

9 Episode Mentions
Too Afraid to Ask

The purge valve is a tiny switch that lets the car’s engine suck up fuel vapors from the gas tank and burn them in the engine. It helps keep the car’s emissions clean.

Technical Definition

A purge valve is a small solenoid that controls the flow of vacuum from the engine’s intake manifold to the fuel tank. It allows the evaporative emissions system to purge trapped fuel vapors into the combustion chamber during idle or low‑load conditions.

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