Topshelf,

Ahhhhh, I see where that would be a problem. I guess you'd have to wait for it to spill out of the exhaust. You could use a larger piece of tubing to slip over the pipe and let it flow into a catch bottle or can.

The timing thing works pretty good, but you'd have to have some idea how full it was to begin with.

Oh well, another great mystery of the hobby!