PhilD: "breathers are fitted with carbon filters".
Yes, I have some doubt about that too. In some cars, you can see the gas filled to the rim, such as Jaguar, Cadillac or MB, quite common. With Hummer, I cannot see any gas, simply could not pump more gas into it. Auto designers buy gas too, they must anticipate consumers topping off gas, thus must include that as part of the design.
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