Queen,
Assuming you meant "fresh water tank" when you wrote "clear water holding tank," yes, that water would flow through the same pipe. Regardless of whether it starts in the fresh water tank, or from the hose attached to your trailer, fresh water quickly ends up in the same piping. In other words there aren't separate plumbing systems for shore water and tank water. If you are wondering if you can isolate the hot water heater so the outlet pipe won't leak... probably, if you can isolate the water heater. Our Hi-Lo has the valves to that. If your trailer has the valves for this, then the only other thing you'd have to do would be to keep the hot valves on your sink faucets shut...to prevent backflow to the leak when the cold valves are open.
I hate to answer a question with a question, but regarding how to repair your leak, what year is your trailer? Better yet, what type of plumbing does your trailer have? Older Hi-Lo's used hard CPVC piping and newer trailers use flexible polybutylene (PB) tubing. Each is repaired in a different way.
Can you actually see the leak, or are you seeing the result ( water flowing across the floor)?
BTW, welcome to the HTF!
Jim
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1967 17' Hi-Lo Bon Voyage (1967-1969)
1969 19' Hi-Lo Bon Voyage (1969-2011)
2004 27' Hi-Lo TowLite (2010-present)
2015 Chevy Tahoe LTZ
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