What is the gas tank air pressurization system? I tried googling that phrase but didn't find anything related to automobile gas tanks. Does this system try to vent off extra pressure or keep the system under a higher pressure?The gas tank air pressurization system can run at random times.
I understood it to be meant to reduce evaporative emissions.The Volt uses this system to keep the fuel tank pressurized. Supposedly helps to maintain the gas for long periods that it can remain in many owners cars.