Hmm, Im not even sure how that would have gotten in there?

The inside of the tanks are rather simple. And being that the fuel feed is simple gravity feed via a petcock, there is no large hole at the bottom for a fuel pump. The biggest hole is the fuel fill hole so one would think that what goes in that hole should come out that hole.

There are some overfill tubes that run from the filler mouth area, down through the tank and out the bottom.

Outside of that, there is no mechanism to monitor fuel level (two stage petcock tells you when it's time to move to reserve and get more fuel).