Coach water pump for interior when not connected to city water

[CML0264]

Hi Folks!

2007 Newmar Ventana 3935 DP here. Just bought her a few weeks ago and still combing through manuals and learning. Quite overwhelming since our prior RV was a travel trailer.

I was wondering if the interior water pump is supposed to run constantly when the switch is turned on, or is it supposed to build up enough back pressure to automatically shut off (when not hooked to city water source)? I had accidentally left the switch in the on position overnight and heard the humming when I came out the next morning. I turned it off manually. Fortunately I did not overheat it and burn out the motor. I checked all of my interior water sources and the wetbay outside the coach to make sure no water was turned "on". Now I'm just turning it on and off on an as-needed basis if I need to use water, because I don't want to burn it out. My inferior travel trailer pump would cut on and off as the pressure was needed. The one in our Newmar now runs the entire time the switch is on. Good pressure and waterworks appear to work fine, but I don't want to prematurely burn out the motor (unless it's designed this way).

Please advise. Thank you, Chris L.

[pasdad1]

I had this problem before….it was a bad pressure switch on the pump. I just replaced the entire pump, and problem fixed.

[cjorg]

Originally Posted by pasdad1

I had this problem before….it was a bad pressure switch on the pump. I just replaced the entire pump, and problem fixed.

Just did the same on my 2013 Ventana quick easy fix.
CJ

[Capacitor]

The bypass adjustment may need adjusting. Is yours a shurflow with two small Allen head screws?

[shepardmike]

It could have air in the line preventing the water and the pump just keeps running. Find the lowest water valve and open it while the pump is running and see if it pushes the air out. This happens to me frequently. I have a valve in my wet bay that I open up for a couple seconds and it catches prime, builds pressure and then stops.

[alank]

If you have a Surflow, and it adequately pumps water as you say, then it needs to be adjusted. one screw adjusts the pressure that cuts the pump off. The other screw adjusts the pressure where the water bypasses back to the pump intake. The pump should cycle on and off as you use water, always off when not using water.
You either need to decrease the cut-off switch pressure so it's below the bypass pressure or increase the bypass pressure so it's above the cut-off switch pressure. Best to connect a pressure gage to a water line to see what pressure you are now pumping and adjust from there.

[Winemaker2]

Check your city water / tank fill valve in the wet bay to be sure it wasn't left in the tank fill position. If so the pump runs all the time and pumps water back to the FW tank in an endless circle.
A cracked or leaking inlet screen on the pump will allow air into the pump inlet & system and can cause pump to run as well.
Eliminate the simple things first.

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