fuel tank capacity

[Billy 1931 Model A]

Almost had a dangerous situation today. Took the A for a ride and the fuel was approaching less than ¼. Stopped and filled it with over 7 gallons. Oops, I could see the fuel liquid behind the fuel gauge window, and the fuel was leaking out of the little octagonal fitting surrounding the fuel gauge window, onto the floor mat. For the first time I saw the F in the window. I'm never filling her beyond 3/4 in the future.