I bought the boat this spring and the tank was empty when I got it. The drain valve was open all winter. It is hard to explain the smell of it. My wife says that it smell like rotten egg but I don't think so myself. I find that it smell more like some of the chemistry project
I used to do when I was in high school
. I read somewhere that it could be the smell of hydrogen, don't know myself what hydrogen smell like.
And yes, the cold water is just fine. No smell whatsoever.
Yesterday, after I drained the tank again and refilled with fresh water, I isolated the water tank from the engine line and went motoring for an hour. My idea was to take the engine out of the equation. If the smell comes back, then I'll know for sure that it got nothing to do with the engine heating
line (I thought that maybe the antifreeze
from the heating
line could be leaking in the tank). When I came back the hot water was still smelling OK. Last time I did this kind of flush, it took a couple weeks for the stink to come back.