I was noticing a gas vapor smell in the cabin, no evidence of leaking under the car. Detected that the gas tank was weaping some fuel in the trunk. Pulled the tank, found it had partially collapsed on the front face (facing the back seat). Small cracks had formed at the creases where the buckling occurred. I checked the vacuum purge valve and it does not appear to be blocked (checked with vacuum on tank side). Vapor canister and lines all appear clear, not blocked. Will install a new tank and purge valve - just in case. Has anyone else experienced this and have I missed anything? BTW, tank otherwise looked nearly new and apparently no internal rust.

1992 500e 140k miles