Identify what brand your fuel pump is. If it is Mikuni, it should be relatively popular, like the dual round pump.
Example kit: Mikuni Fuel Pump Repair Kit - Shade Tree Powersports
i would tear into the carbs and clean them. i wonder if the floats are stuck up blocking fuel from filling the bowls.
by the way, yamaha has the fuel pump listed on the "air cleaner" section. their part number may be 8V0-24410-02-00, if i recall correctly