Metal in fuel water seperator.

My buddies boat was idling rough today so we decided to change the water fuel seperator. We cut the old one open and found a lot of metal and junk and we are trying to figure out what it could be. He has had the boat about two weeks and bought it from the original owner that always kept it inside and winterized it apparently. You guys helped me out when I found a bunch of trash in my oil filter so I figured I would give it another go.

Everything in the picture is very very thin metal that crumbles in your fingers.