[Christ]

Originally Posted by moTthediesel

Yeah that was my thought as well. The funnel I use now reaches all the way into the tank, and I use it like a dipstick. But once you overfill it, there's nothing you can do. With a float gauge you could slowly inch it up to the mark. Some kind of a float switch could work, but I'd be a little leery of using anything with an electric circuit inside a gas tank

Um... like a fuel pump?

Sparks in liquid fuel do nothing but electrify the liquid fuel (which is conductive, by the way.), while sparks in vaporous fuel can cause serious problems, unless there isn't enough air to ignite the fuel vapor... like in a fuel tank.