When I was young and working at a gas station, I remember that most of the cars would produce a whistle which would let you know when it was almost full. I can't remember whether that was a function of the pump or the car.

1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed

My Chevy Master 4 Door is on the Road!