mrsrobinson
Well-Known Member
I was thinking the same. With the pump off does it still empty out?Without the freshwater pump on pressurizing the system wouldn’t it just leak down? This one has my curiosity up
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature currently requires accessing the site using the built-in Safari browser.
I was thinking the same. With the pump off does it still empty out?Without the freshwater pump on pressurizing the system wouldn’t it just leak down? This one has my curiosity up
This and/or the waterheater thermostatic valve.Do you have an anchor wash down? Perhaps the spigot is turned on and draining out.
That would make sense, and he being in Ontario, improper winterization might cause a crack in the heat exchanger lines and the pressurized water would flow into the lines and back through the engine cooling system. that would be hard to detect because the water would be going out underwater.If that much water is being lost and it is not in the boat the heat exchanger in the hot water heater that connects to one of the engines is the likely leak.
Exactly. Had a similar issue on my boat and that’s what it ended up being.Didn’t read all replies…
my money is on water heater pressure relief valve. Mine currently leaks and will lose a half tank if the pump is left on overnight
I was thinking the same. With the pump off does it still empty out?
That would make sense, and he being in Ontario, improper winterization might cause a crack in the heat exchanger lines and the pressurized water would flow into the lines and back through the engine cooling system. that would be hard to detect because the water would be going out underwater.
@Rigby the way to test for that is to make up a bypass for your hot water tank. Basically connect the tank inlet blue line to the tank outlet red line. You will need some piping to do that. Then when you leave the water pump on, if your water loss stops, then that is your issue.
Here is what I use when I bypass my water heater for winterization. Its a short length of 1/2 garden hose with hose clamps on each end. View attachment 131005
That adds a new twist to this mystery.it does not.
if the water pump is turned off, the fresh tank retains its level.
Check the shore water pressure regulator. You may have a leak here when the tank is pressurized. I had one do this on a trip. Ending up removing the regulator and plugging the line until we were back home.it does not.
if the water pump is turned off, the fresh tank retains its level.
It's not - that coil in the water heater is normally the engine's coolant (antifreeze). If it leaked the fresh water system being a much higher pressure would lift the engine's expansion tank cap and overflow the expansion bottle and then be all over the bilge and a real mess with engine coolant. Maybe some have it hooked up to raw water but it wouldn't be correct.Someone correct me if I am wrong, how can it be "heat exchanger in the hot water heater that connects to one of the engines is the likely leak." if it only occurs when the system is pressurized? That runs from the engine and then back to the engine, raw water.
The raw water heating lines run in coils inside the water chamber of the heater. So if those coils fail and leak, the raw water is connected to the house water inside the tank. Then when the water pump is on, the pressure in the tank will force water out into the heating coils and into the engine cooling system. Many (most??) gas great lakes boats are raw water cooled, not closed cooling.Someone correct me if I am wrong, how can it be "heat exchanger in the hot water heater that connects to one of the engines is the likely leak." if it only occurs when the system is pressurized? That runs from the engine and then back to the engine, raw water.
So…. Any update?