Why is it generally prohibited to fuel a passenger vehicle while passengers remain aboard, except under specific safe conditions?

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1. This restriction applies only to vehicles fueled with diesel, not gasoline
2. Fueling presents a fire risk, and passengers should generally be clear of that hazard when it occurs
3. This rule exists only to speed up the fueling process
4. Fueling with passengers aboard is always completely safe under any circumstance, since modern fuel systems are sealed against vapor escaping

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