Sounds like something might have been modified by a previous owner. There is nothing in front of the shower that would have a water line. My water pump is in the rear cabinet by the kitchen sink. I have heard of some of the water pumps being installed under the bathroom sink, maybe you should open up the bathroom access and see if your pump is under there. Could this be a line the goes from the pump to the water system?
My Fresh water tank drain is located under the belly close to the black tank, the city water line shouldn't be connected directly there.
Have you tried filling up your fresh water tank and run on your pump to see if the line is still leaking? This might help with some troubleshooting.
Also my low point drains are located outside under the kitchen sink, could the line be a low point drain? If so, just cap it off.
One my 289 I have three capped of lines, low point hot and cold and the fresh water tank drain. Check and make sure you have all three capped.
When you get your pictures uploaded, it would help us all help you!
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2014 Denali 289RK
2017 Nissan Titan XD Pro-4X CC.
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