We have the same setup on our 37/40+. We found that if we empty one tank and simply turn on a second one, the pump logically pulls air from the empty tank and does not stop. I'm sure if we left the two valves sit open, the tanks would equalize over time. We might try drawing from the side tanks at the same time so they would draw down equally and not end up with weight differential, but I wonder how long it would take for the higher tank to fill up the lower tank on a long tack...At any rate, yes it is normal.One other thing, I found the "X" o-rings available at McMaster Carr are really good for sealing the inspection ports on the tanks, which is probably where your leak is coming from. Those caps can leak on an aggressive tack as well.Good luck,Bruce Whitmore Sent from Samsung tablet. -------- Original message --------From: Ken Heaton via CnC-List <cnc-list@cnc-list.com> Date: 5/11/19 7:29 PM (GMT-05:00) To: cnc-list <cnc-list@cnc-list.com> Cc: Ken Heaton <kenhea...@gmail.com> Subject: Re: Stus-List Water tank control manifold That's exactly what happens on our 37XL so we usually have only one tank turned on at a time. We have the same three tanks and like yours, the front one is higher that the side ones. We generally use the front one first. We also find having one tank on at a time helps us gauge how much water we are using and how much we have left.Ken Heaton & Anne TobinS/V Salazar - Can 54955C&C 37/40 XL - Hull # 67Cape Breton Island, Nova Scotiahttps://c-c-37-40.blogspot.ca/p/salazar.htmlOn Sat, 11 May 2019 at 20:05, David Knecht via CnC-List <cnc-list@cnc-list.com> wrote:I have been wrestling with what I thought was a leak in the tubing from my front water tank and could not find the leak. I have a tank on each side and one in the front. Several times I have come to the boat and found the front tank empty. Sometimes the bilge was full of water and sometimes not. When I came to the boat today, I found the front tank empty and then realized that the side tanks were near overflowing (more full than when I left). What I realized is that the water in not leaking out of the tubing, but rather it is leaking from the front tank into the side tanks. The tubing from the three tanks lead into a manifold where I can choose which tanks are used for water. If all three lines are open at the manifold (which they were this time), the front tank sits higher than the side tanks so the pressure moves the water from the front to the side tanks and if they are fairly full, thent he water overflows and leaks into the bilge. So now I know that I should not leave all three open at the same time. I can use the front tank first, and when empty I can switch to the side tanks. Is this a normal arrangement or am I missing something? Thanks- Dave S/V Aries1990 C&C 34+New London, CT
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