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Old 11-19-2014, 09:23 PM   #1
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Water Pump with City water question

Is it normal for the water pump to not turn off or "pressurize fully" when connected to city water. Everything works normally and water pump turns off and fully pressurizes if city water is turned off. However, with city water turned on, it seems there is air entering the system somewhere and the water pump will not shut off and sputters. I normally do not use the water pump when connected to city water but was just curious what would cause this or if it is normal.?
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Old 11-19-2014, 09:38 PM   #2
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When you turn on the water pump and have shore water, is there water in your fresh tank also? Have you noticed any water leaks anywhere Floor/Basement Area?
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Old 11-20-2014, 10:13 AM   #3
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Water Pump Question

The water tank is 3/4 full which I have been told is probably best given winter conditions and am connected to shore water most of the time. I have a heated pad under the water tank. I have never noticed any leaks and seems like it has always been like this since purchased new.
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Old 11-20-2014, 10:50 AM   #4
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Sounds like the check valve has some debris in it allowing you to push water back into the fresh water system. What pressure does the fresh water system show????
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Old 11-20-2014, 11:11 AM   #5
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If the fresh tank is full above the outlet (Outlet completly covered) the on-board water pump may turn on when you draw water if the city water is not powerful enough (not enough flow or not enough pressure) but it should shut off, same as if you are on "Self Contained".

If it's not shutting off then I suspect the check valve on the city water inlet, Something is holding it open and water is being returned to the park system.. OR... the pump is vapor locked,, That is it has sucked air out of the tank (When the tank was too low or due to improper valve settings on the inlet side of the pump) and is trying to compress air, Since Air compresses nicely it can not force enough into the line to shut off.
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Old 11-20-2014, 07:14 PM   #6
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Water Pump Problem

The fresh water tank produces "normal" water pressure when using the tank (no city water) but not sure the psi. Everything works normally except I cannot increase pressure to the city water using the water pump. I am not too concerned because everything is normal when I am just using the water tank of city water but was wanting to make sure nothing more serious could cause problems down the road. Just seemed unusual the pump sputters and will not turn off when on city water. I have checked valve positions of the winterizing valve etc to make sure it was not in the wrong position and sucking air. Thanks for replies....
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Old 11-20-2014, 07:45 PM   #7
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Maybe I'm not understanding, but why would you have the water pump switched on when under city pressure? It would seem that in your senario the city pressure is very close to the pump pressure setting, causing some fluctuation until the pump equalizes the pressure. If that's the case it would happen everytime you open a faucet
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Old 11-20-2014, 07:57 PM   #8
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I will answer for him.. Got up the other day and made my morning coffee, No problem but the pump did run.

On the way to do some work on a friends RV (well the way back) my neighbor hailed me.. A woman backing her Class C out of Site #2 clipped the water bib and broke the pipe... Shot water a good 15-20 feet in the air, Park man-friday shut off the water to the park till he could get parts and tool to fix it. Did not bother me at all, Coffee was just fine.
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Old 11-21-2014, 09:16 AM   #9
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Normally, would not use water pump with city connection. However, some parks have low water pressure and I was under the impression I should be able to use the water pump with city water connected to increase the pressure a bit. Not an issue normally, but in my case, all that happens is sputtering of the pump and no pressure increase. Not that concerned about it because no apparent leaks etc but just wondering what could be causing that.
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Old 11-21-2014, 05:00 PM   #10
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Update to the water pump problem. I rechecked all valves and everything was in the correct position. I decided to try and prime the pump using the winterization valve. After the pump finally primed, I switched back and forth between the winterization valve and the water tank. My best guess is that there was an air lock between the water tank and the water pump but after much water going through the winterization intake and switching back and fourth everything seem to be acting normally now. Thanks for input on this.
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Old 11-24-2014, 08:46 AM   #11
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Problem is with City Water Valve, I had the same problem and replaced CWV, now everything works as normal
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Old 12-17-2014, 10:50 AM   #12
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Quote:
Originally Posted by falconman View Post
Maybe I'm not understanding, but why would you have the water pump switched on when under city pressure? It would seem that in your senario the city pressure is very close to the pump pressure setting, causing some fluctuation until the pump equalizes the pressure. If that's the case it would happen everytime you open a faucet
I use the pressure regulator that was supplied when I purchased my MH. When taking a shower though the city water pressure is really low and I can turn on my water pump and get better pressure. Is this normal? Yes I am a MH newb.
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Old 12-17-2014, 05:01 PM   #13
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Yes, the pump will assist with water delivery if you like. However, a better quality regulator with a higher flow rate would probably eliminate the need. Your low pressure problem is actually a low water volume problem.

Many experienced RVers use a Watts "whole house" sized regulator, but even one of the Hi-flow models from Camco or Valtera ought to help.
Here's an article that explains the problem(s) and solutions.
https://www.rvwaterfilterstore.com/ABPressure.htm
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Old 12-17-2014, 05:07 PM   #14
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It was suggested/discussed a long time ago, that if on city water, low pressure, lets say 30 psi, that if one turned on their water pump that put out 45 psi that the water pump pressure of 45 psi would just close the check valve on the incoming city water and just use the onboard water in the tank ???? What do you think?
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