I recently replaced the water pump in my foretravel RV. I now have dark water for about five seconds when I first turn the water on. Is there something in this new pump that could be breaking loose. I filtered it through a paper towel and it feels gritty???
Did you flush it out prior to installing it? The instructions may have said to do this prior to installation. If not, I'd just run a lot of water thru it for a while to see if the black stops. It might be the piping where it was connected on each side. Sorry, can't help more than this.