Umm, pumps don't record fuel quantity, they err, pump fuel.
And even if it was a quantity indication issue, there's other methods to obtain an accurate quantity which don't require offloading passengers. Drip or float sticks.
For what it's worth the fuel is measured via a capacitance system.
Now, if you are talking about the fuel truck pump system not giving a reading on its meter, well, there are ways around that too.