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Old 07-07-2015, 08:59 PM   #1
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City water and water pump used at the same time?

Can you hook up the city water line and also have the fresh water tank with pump using them at the same time? Will this have any negative effects on the plumbing? Will this increase the water flow over just using either one on its own?
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Old 07-07-2015, 09:06 PM   #2
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This only works well if the (City W/P) is BELOW your Pump output Pressure! Youroo!!
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Old 07-07-2015, 09:17 PM   #3
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This only works well if the (City W/P) is BELOW your Pump output Pressure! Youroo!!
Thanks, what happens if the city w/p is greater than the pump output? Pump won't come on?
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Old 07-07-2015, 09:34 PM   #4
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No real advantage to running both at the same time and there is the chance you and cause the back flow valve in the pump to seat incorrectly thus filling the fresh water tanks to overflowing.
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Old 07-07-2015, 09:37 PM   #5
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City water pressure will keep the pump check valve from opening......if no check valve city water would flow to fresh water tank and overfill.
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Old 07-07-2015, 09:45 PM   #6
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What are you thinking the advantage would be of running both systems at the same time?? You don't have enough water pressure???
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Old 07-07-2015, 09:50 PM   #7
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The only advantage I can see to do this would be if you had really poor or low water pressure on the city water. If the city water is maintaining proper pressure on your plumbing system then the water pump should not and would not run at all.
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Old 07-07-2015, 09:53 PM   #8
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No, my friend did this while camping last weekend and said he gets higher water pressure using both. I thought he would damage the plumbing by doing that. Thanks for the replies!
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Old 07-07-2015, 10:01 PM   #9
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No, my friend did this while camping last weekend and said he gets higher water pressure using both. I thought he would damage the plumbing by doing that. Thanks for the replies!
Not possible unless city water pressure is really poor.

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Old 07-07-2015, 10:04 PM   #10
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Not possible unless city water pressure is really poor.

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Thanks, will have to mention this information to him!
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Old 07-07-2015, 10:04 PM   #11
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Here's the quick and dirty on how it works:

Power to the pump runs through a main switch and a pressure switch. When the main pump switch is turned ON, and pressure in the water line is low, the pressure switch closes and starts the pump. When the pump brings the pressure up, the pressure switch opens and turns the pump off. City water pressure is (or should be) higher than the setpoint of the pressure switch, so city water will always keep the pump from running (unless you put a REALLY large demand on it by maybe opening every faucet). Also, as stated above, the city water pressure will backseat the pumps check valve, so unless you've got a really strong pump, even if it's running, it may not actually be pumping anything.

Is your friend SURE the pump was actually running while he had city water going, too? I won't say it can't be done, but it's highly unlikely.
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Old 07-07-2015, 10:10 PM   #12
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Could your friends rv have a problem.
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Old 07-07-2015, 10:19 PM   #13
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The other thing I'm thinking about is he'd also have to fill his fresh water tank "if this whole scenario " was possible , as the city water line comes in "after" the pump not "before" it.
The pump in order to "supply" water and "pressure" would have to draw it from the fresh water tank.



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Old 07-07-2015, 10:53 PM   #14
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Before I realized that my water pressure regulator was cheap junk and throttled psi back to about 30# I used to run my pump for shower pressure. Yes, the pump would run.


Yes, the fresh water tank level would drop and I would occasionally add water.


Now with an adjustable regulator and an Oxygenics shower head, all is good on shore water.

Bill
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Old 07-07-2015, 10:54 PM   #15
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Old 07-08-2015, 11:58 AM   #16
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I have done this while living in a rural RV park. Occasionally the pump would come on while taking a shower and the pressure seemed to improve. It didn't do it all the time and I always figured that the park water pressure fluctuated according to how many were using water. The water system was fed by a well with pressurized tank.
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Old 07-08-2015, 12:07 PM   #17
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Originally Posted by bend302 View Post
Before I realized that my water pressure regulator was cheap junk and throttled psi back to about 30# I used to run my pump for shower pressure. Yes, the pump would run.


Yes, the fresh water tank level would drop and I would occasionally add water.


Now with an adjustable regulator and an Oxygenics shower head, all is good on shore water.

Bill
I think.. (hahaha) that Bill's friend gets "low" water pressure because of his camco pressure regulator when connected to city water as compared to the pressure created by the pump. Thus the only time an increase in pressure is truly desired is while taking a shower. So, with that said, he probably only turns on the water pump while showering to take advantage of the pump pressure and he probably keeps adequate water in his fresh water tank since the pump pressure keeps the city water check valve closed and is only able to draw from the tank water.

ps. yes, I'm his friend...
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Old 07-08-2015, 01:01 PM   #18
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I think.. (hahaha) that Bill's friend gets "low" water pressure because of his camco pressure regulator when connected to city water as compared to the pressure created by the pump. Thus the only time an increase in pressure is truly desired is while taking a shower. So, with that said, he probably only turns on the water pump while showering to take advantage of the pump pressure and he probably keeps adequate water in his fresh water tank since the pump pressure keeps the city water check valve closed and is only able to draw from the tank water.

ps. yes, I'm his friend...
Hey, I have more than 1 rv friend! But yes, it was you! Hahaha
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