I think the answer has been found
[QUOTE=Bobmws;818464]And that will cause on over filled tank to vent fuel. Ask anyone who has removed the splash guard from the filler neck to get a few more ounces capacity. You will see the fuel coming out as they leave the station, especially under heavy throttle.[/QUOTE]
I have had the same thing happen. Ride it and keep an eye out for more fluid.
Gas overfill: The gas expands in your tank if . . .
The gasoline expands in your tank if the bike is running or warm or hot.
The gas in the tank in the ground at the gas station is around 55 deg. F.
The tank on my 85 K100RS sometimes gets uncomfortably hot to touch which means its around 160 deg F. The fuel expands as its temperature increases, beware.
Wiki Answers Goes like this: "Because gasoline expands and contracts based on temperature, the industry uses a standard temperature -- 60 degrees Fahrenheit -- as part of its definition of a gallon. To the industry, a gallon of gasoline is the amount of fuel that occupies 231 cubic inches at 60 degrees.
But at 75 degrees, the same amount of fuel occupies 233.4 cubic inches. At 90 degrees, the gas expands to 235.8 cubic inches.
Read more: http://wiki.answers.com/Q/How_much_does_gasoline_expand_with_temperature#ixzz270NZ2l"
So from 55 deg F in ground to 155 in hot tank, 5 gallons grows almost 75 cubic inches, over 1 liter (quart).