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Originally Posted by MikeT
...As a side rant, how many filling stations actually have workable filler hose flaps that properly and completely seal off the filler neck from the atmosphere during gasoline refuelling, so the HC-laden air in the tank is displaced into the activated charcoal canister? None that I've ever seen. So although the tailpipe emissions of some gasoline engines are very clean in a relative sense, when refuelling, that is all undone (and then some) by all the HC fumes that are pumped into the air at the fueling station.....a volume of HC contaminated air equal to the volume of the tank in many cases....
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It doesn't work like that anymore, at least not over here. Instead there is an air pump sucking in air near the top of the nozzle. The fumes are then brought back to the gas container. Some fumes can certainly escape, but most is captured. The old gas pumps without this kind of recirculation are banned.
From what I've understood, this recirculation more or less pays for itself, since you pay also for the fumes that are recirculated. The gas station gets paid twice for them.