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By PotatoCake · Posted
Thanks for that, sounds like its definitely worth getting as part of a freshen up -
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And no, this was not posted on April fools. https://www.theautopian.com/bmw-wants-you-to-drive-with-an-air-compressor-attached-to-your-wheel/ What happens when it's not attached properly and flies off into somebody's head?
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By joshuaho96 · Posted
https://sci-hub.se/https://doi.org/10.4271/2005-01-3825 Heat causes positive pressure in the tank, a slight vacuum in the tank is normally caused by evap purge during normal driving. If the tank is cooled it can also cause a vacuum that pulls air into the system. The linked paper is quite interesting to learn the state of the art for evap fuel control, modern systems the tank is 100% sealed and the tank is reinforced to handle higher than normal pressure/vacuum. It only opens the vent/charcoal canister when you press the button to open the refuel door or when the engine is running. After some reading of systems like the W220 S-Class there's a check valve on the tank vent, but the primary reason it's there is because otherwise the intake manifold would be pulling vacuum on the tank: https://w220.wiki/EVAP_system There might be limited vacuum relief via the charcoal canister, but I don't know how sensitive the check valve is.
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