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Old 12-04-2015, 08:41 PM   #1
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Use of pump while connected to city water

The pressure of city water is low. Will it hurt the water pump if I turn it on?
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Old 12-04-2015, 08:57 PM   #2
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I could be wrong but the pump only sucks and pumps water from the water holding tank. i don't see how it will increase water pressure while using city water connections. In fact if your water holding tank is empty the pump would be sucking air and running dry which is probably not good for the pump itself. If you have a pressure regulator in line with your hose you might try removing it just watch out that the city water pressure doesn't rise to high for some reason.
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Old 12-04-2015, 09:01 PM   #3
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No. It will not hurt the pump, just make sure you have water in the tank. I have had the problem at some parks low water pressure. Fine for sinks, I just turned on pump to take a shower with tank water. Remember pump draws water from tank.
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Old 12-04-2015, 09:35 PM   #4
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The pressure of city water is low. Will it hurt the water pump if I turn it on?

If shore pressure is connected and on, the pressure switch will read the shore pressure and prevent the pump from operating. If you attempt to operate the pump anyway, shore pressure will damage the suction non return valve and allow back flow into your tank. Plenty of threads on the forum about this. You can fill the tank, secure shore pressure an then use the tank and pump.
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Old 12-04-2015, 09:59 PM   #5
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Thanks all for the quick replies. It makes sense the pump only takes water from tank. I therefore filled it and switched on the pump. Of course I disconnected the city water.
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Old 12-04-2015, 10:43 PM   #6
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If shore pressure is connected and on, the pressure switch will read the shore pressure and prevent the pump from operating. If you attempt to operate the pump anyway, shore pressure will damage the suction non return valve and allow back flow into your tank. Plenty of threads on the forum about this. You can fill the tank, secure shore pressure an then use the tank and pump.

Not sure this is entirely true. Would depend on the input pressure from the city water line. If the city pressure is higher than what demand for the pump is, it won't run anyway. The pressure switch/backflow preventer is always subjected to city water pressure, regardless if pump is on or not.


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Old 12-04-2015, 10:56 PM   #7
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Not sure this is entirely true. Would depend on the input pressure from the city water line. If the city pressure is higher than what demand for the pump is, it won't run anyway. The pressure switch/backflow preventer is always subjected to city water pressure, regardless if pump is on or not.


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X2. I use the tank water and pump all the time at Rally's to have a decent shower.
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Old 12-05-2015, 07:45 AM   #8
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The pressure of city water is low. Will it hurt the water pump if I turn it on?
The RV operators manual states "do not" operate the pump while connected to external water source. As long as you turn off city water, not a problem.
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Old 12-05-2015, 08:02 AM   #9
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X2. I use the tank water and pump all the time at Rally's to have a decent shower.
does that work B&B ? I always carry a rain bird pressure gage with me to check the water pressure at the site. If under 55 psi I don't use a regulator. I know that's probably a bad Idea, just in case of a spike, but in reality I have never seen it go up once it's measured but it can. My system works best at that pressure of 55 psi. Your thoughts please?
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Old 12-08-2015, 08:00 AM   #10
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Not sure this is entirely true. Would depend on the input pressure from the city water line. If the city pressure is higher than what demand for the pump is, it won't run anyway. The pressure switch/backflow preventer is always subjected to city water pressure, regardless if pump is on or not.


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Here we go again, post from today. This back flow has been going on since xxxxx was a child. Only when the pump is paralleled to shore water.

"have a 2013 Rockwood A127TH. Today, I came out to a park and hooked up the water line. About an hour later I noticed that water was flowing out from the fresh water tank inlet (located outside of the camper on the left side). I know for certain my fresh water tank was empty before arriving, but it's now full. Once I turned off the park's water line (eliminating that water pressure to the camper), the water is no longer flowing from the fresh water tank inlet, but the fresh water tank is still full. What is going on? I'm not losing water at any other point. Could this be an issue with the fresh water pump allowing water to pass from the city water line thru the pump into the fresh water tank?"


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