had a look in my tanks, theres 2 little holes, one has a bit of water in it, does this mean the seal has gone ?. i heard a horror story of the inside of the tank rusting and clogging up the whole fuel system.
I think you mean the air vent holes and I would assume the water is probably condensation or similar. As long as there are no signs of major amounts of water I would guess all is OK.
I'm sure some one clever will be along soon to conform all is OK.