In my point of view: Yes. There’re some “rules” that must be observed during refueling. For instance: Distance from refueling devices – truck, hoses, etc - and other vehicles or personnel not involved during that procedure, ex. catering and cleaning services, cargo and pax boarding, etc. My airline instructs crews and ground staff to alert all passengers prior to boarding the airplane to avoid some actions, like taking pictures using flashes, use of cell phones, lighters, matches, etc. They seem obvious, however I’ve seen some passengers smoking just after leaving the airplane…So, bus maneuver and boarding beside a fuel truck are not quite unsafe, but must be avoided if safety instructions are not followed.
bkmk