Gas expanded and overflowed over night?

Gasoline 100% expands & contracts with temperature, the question is, how did You manage to get it that full? The vent tube may very well be plugged, which would trap pressure in the tank as the volatile gasses try to expand at a rate geater than the liquid, if the liquid reaches a point it can seep out the pressure will make sure of it.
I experienced a gasoline overflow years ago in the private shop I worked at. Customer brought work van over for service the next day, & We pulled it in on the floor mid-shop before closing up, outside temps were similar to current ones(15-20°F), & left. Next morning there was a puddle of gasoline almost half the size of the van under it, We opened both doors & I killed the furnace, don't know how that place didn't blow to this day. Called the guy, "Oh yeah, I filled 'er up across the street before droppin' it off", oye........