Just doing a bit of wiring and found damage to the inside wall below the water filler. Probable cause is a bad seal between the external checker-plate and filler surround frame. I'll be slapping a bit of silicon on mine to hopefully prevent the problem from getting worse.
My vans a 2012 model and has always been outdoors with no cover but I'd advise checking yours anyway because the depth of the checker-plate and thickness of the gasket when installed don't look like there was ever a good seal.
My vans a 2012 model and has always been outdoors with no cover but I'd advise checking yours anyway because the depth of the checker-plate and thickness of the gasket when installed don't look like there was ever a good seal.