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As I understand it, one of the pins vents the tank when pushed in, and the other opens the fuel pickup passage. So if the tank is sitting in the sun with no hose connected, pressure can build. If the vent valve is tight and the fuel valve leaks, fuel will be forced out–potentially quite a bit. Leaving the cap loose should prevent spillage, or you can use a cap with a vent screw from the small tank sold with the smaller motors.
This is why most tanks, other than these OMC designs, have a vent screw in the cap. the OMC tank design is clever, and convenient when everything is right, but there are a lot of bits to be right.