Mine is in the shop since 8/15 getting her engines put back in so I can't take a look now; I took a quick peak through the two access plates but not a good enough one to identify the metal.
Are you getting fuel contamination or something bad?
Thought I might have been picking some crap up from the tank, I have heard that the ethenol fuels eat away at the fiberglass tanks and just wanted to see if anyone new the material. Im hoping its metal,
On mine there is a round deck hatch between the front two seats where you can access the fuel fill and vent fittings on the tank and another when you lift up the back seat where you can access the fuel pickup fittings. There was no foam in either location on mine so you were looking at the metal top of the tank.