Sounds just like the good ol phuket air 74 in SHJ. The ultimate decision would rest with the captain. Obviously you would not want to evacuate pax into a fuel leak. It has a rather blinding effect. With fire crews at the scene, the flight deck would have been in contact with them. Seems perhaps the tanks were full to the brim and some fuel was coming from the surge vent.
Again evacuating pax into a fuel leak when many would have mobiles on to film to get famous, poses a modern day issue to any commander.