Look what I found in my gas tank

[Guest]

http://imgur.com/hcpmd3m

I have to clean up the tank because the sealant inside is peeling off, and I found this weird foam block in there.

Any idea what it might have been, besides something that accidentally fell in?

[steve murdoch]

I have seen foam used as a baffle/anti-slosh in gas tanks, mostly race bikes, ATV or jet ski that makes sudden turns or stops.
Certainly looked different than your piece but who knows?

[Nessism]

http://imgur.com/hcpmd3m

I have to clean up the tank because the sealant inside is peeling off.

I'd say this should cover it...