Korkie
Active Member
- Feb 2, 2016
- 1,331
- Boat Info
- 2006 340 Sundancer, Garmin 7610, xHD 24 Radar, VV703, SeaStar Hydraulic Steer, Shadow Drive AP
- Engines
- Mercruiser 496 Mags
Bravo III Drives
Sure would be nice to know the result of this mystery.
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@Rigby did you find your leak?Hi guys sorry about silence (notice post #30 I was away on other matters).
3 things have been learned:
1. I had a tech over to install a new impeller and he took an initial look..my cooling system is closed loop, so what I thought was the most likely answer seems to have been ruled out.
2. When I checked the bilge for water I looked in the engine compartment...no water there. But the tech mentioned that the hull may be divided with multiple chambers. So we pulled up the cabin carpet, opened the floor, and that section is bone dry.
3. Pulled the aft cabin mattress and panels out, to look at the fresh water tank and fittings. Everything looks fine, nothing is wet there.
Ongoing when the tech returns, I guess. Unfortunately at my marina he is only allowed on-site on thursdays, very frustrating.
nailed itHave had 2 instances where we were loosing fresh water from the tank. One was a leak from shore water pressure regulator. Second was a pressure release valve from the hot water tank. Both easy to confirm as there are tell tale leaks from the vent overboard for the pressure release and the regulator would be leaking in or around transom locker. If you don't loose water with the fresh water pump or the hot water heater on it is also a sign that you leak is when pressure is applied to the tank.
Yep, right tank. After filling the lights say full. 60-90min later it is at 3/4. Another 30-60 min later it is at 1/2.
I agree it is a LOT of water. Since buying the boat i have pumped out once but somehow filled the fresh water 6 times. It is so puzzling. The system HAS to be leaking somewhere downstream of the pump, and not into the bilge or waste tank.
One thing I have not done yet is hook up the water inflow fitting (in the transom trunk) to city/shore water and just let it rip. I should be able to hear it or see it somewhere. Will try that tomorrow.
That makes sense that the fitting would drain overboard. If it didn't, then if the valve stuck on and you were connected to the shore water, your boat could potentially sink if the bilge pump couldn't keep up.So since you are in a water problems thread maybe you are interested in this. I did try the above, and that isn't what led to a solution, but I learned something anyway. My tech says that my boat, and most boats, have water systems rated for 20-30 psi. My particular marina's shore water connections at the slips are delivering city water at 60psi. Guess what that results in - yep - he alone has serviced 5 boats this summer which managed to blow fittings while the owners were away and left their shore water on.
My HWH pressure relief valve drains onto the engine room floor and finds its way to the low point in the bilge where it is pumped overboard by the bilge pump.
PROBLEM SOLVED
So according to the tech, the pressure relief valve at the Hot Water Heater was somehow stuck in the open position. He has ordered a new one, but in the meantime the old one (having been removed and examined) is now 'unstuck' and working, since I no longer lose fresh water.
As to where the bloody hell this water was going? It doesn't go into the blige. From the relief valve, it goes to a drain that is right at the waterline and the tech says "you would never see or hear that.
Thanks to everyone who contributed here, it sure was a puzzle to me.
You can purchase a regulator Amazon $25 and attach it to the shore water outlet. Set the pressure to 35 psi and save your boat regulator and thus your fresh water system from over pressureSo since you are in a water problems thread maybe you are interested in this. I did try the above, and that isn't what led to a solution, but I learned something anyway. My tech says that my boat, and most boats, have water systems rated for 20-30 psi. My particular marina's shore water connections at the slips are delivering city water at 60psi. Guess what that results in - yep - he alone has serviced 5 boats this summer which managed to blow fittings while the owners were away and left their shore water on.