Glossary / Engine

purge valve

17 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.

Hear It Discussed

"which consists of a charcoal canister [1820.2s] and a purge valve and hoses and all these things."
#2646: Rent a Mongoose Dot Com The Best of Car Talk 30:19

"It eliminates a mass airflow sensor problem if it's just one bank it eliminates a purge valve because it's just one bank"
And You Thought You Had Car Problems - These Guys Can Help Under The Hood show 45:05

"So on a car, there's two devices. There's a purge valve and there's a vent valve. Purge valve is in the front..."
Ron Ananian, The Car Doctor - July 11, 2026 Hour 1 - The Double Whammy Jeep Air Conditioning Ron Ananian The Car Doctor 20:12