Refueling a bus:

Question

You should not refuel a bus with passengers on board unless doing so is absolutely necessary. You should never refuel a bus inside of a closed building while there are passengers on board.

Accepted Answer

May only be done with passengers on board if doing so is unavoidable.

Answer

Should always be done with passengers on board.

Answer

Can be done in an enclosed space if the passengers are told of the refueling in advance.