pumping gas

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It doesn't suck anything up, it's not a vacuum, and it doesn't magically work against the worlds gravity...ZERO fuel is lost (unless you fill it past your overfill drain anyways).

It merely measures the air pressure that is being forced out of your tank as you fill it with fuel. You have the choice of two things in your tank, gas or air, the more fuel you put in it the more air that is being pushed out. When you fill your tank there is no more air to be pushed out therefore it knows when to stop because that air pressure is now gone.

This is what i was told by BP. You might have been informed on stage 1 vapor recovery, but theres recently been a change