Pete – Another suggestion is to use a small air compressor or shopvac to blow air through the lines to determine if/where the blockage is. Do you have the small plastic gate valves at the tank? Those may be suspect. A ball valve is a nice upgrade. Also as you go through the system, if you have any loose fittings air will get sucked in and cause problems too.
Pumps will pull water from the side of least resistance. If the line to your port tank is longer of has an obstruction, the starboard tank gets drawn down until the pump sucks air, then nothing is going to happen. FWIW – In normal use I isolate the tanks with the valves at the tank discharge and only use one at a time. Yes the boat will be heavy on one side, but in this mode I’m not racing and don’t care. When racing all tanks are empty. Hope that helps. From: Joel Aronson via CnC-List <cnc-list@cnc-list.com> Sent: Monday, March 22, 2021 8:56 AM To: Stus-List <cnc-list@cnc-list.com> Cc: Joel Aronson <joel.aron...@gmail.com> Subject: Stus-List Re: water tanks interconnected, or not? Is there a valve manifold somewhere between the line and the pump? Have you tried closing the starboard valve or blowing through the port hose to see what happens? Should not be hard to troubleshoot if you know where the lines run. On Mon, Mar 22, 2021 at 2:55 AM Peter McMinn via CnC-List <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> > wrote: I have a 30gal water tank under both settees. The valves for each are set to open flow. However, the pump seems to draw only from the starboard side. I’d assumed that with both valves open, the tanks would equalize, but the stbd tank empties and the pump goes dry, while the port tank remains full. Can someone venture to what’s going on? I’ve read this 2015 discussion <https://cnc-list.com/empathy/thread/2KB2NSDGELMQQJSRMPPWPHVMCWQJ2ICR?hash=SLQZNGDWP5TUBYWW6HFGKHJT5DVCWB5F#SLQZNGDWP5TUBYWW6HFGKHJT5DVCWB5F> , but the OP then was interested in disconnecting the two tanks. I’ll do some exploring tomorrow to see what might be preventing the tanks from equalizing. Ideas are welcome. Thanks to all of the subscribers that contributed to the list to help with the costs involved. If you want to show your support to the list - use PayPal to send contribution -- https://www.paypal.me/stumurray Thanks - Stu -- Joel
Thanks to all of the subscribers that contributed to the list to help with the costs involved. If you want to show your support to the list - use PayPal to send contribution -- https://www.paypal.me/stumurray Thanks - Stu
