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Old 05-04-2016, 07:57 PM   #1
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City water/water pump... dumb question!

Here's potentially a dumb question... When hooked up to city water should I be running my water pump?


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Old 05-04-2016, 08:03 PM   #2
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Here's potentially a dumb question... When hooked up to city water should I be running my water pump?


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No. It really shouldn't run that often as long as the pressure from the city water system is above the pump automatic pressure switch, but it might occasionally run if you draw a lot of volume. You can turn it off.
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Old 05-04-2016, 08:04 PM   #3
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Water Pump

Short answer...no. Water pump draws from the fresh water storage tank. When hooked to city water the water comes directly from the hose and (hopefully) filter using the city water pressure to feed the faucet, shower, etc. At least this is the way mine works.
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Old 05-04-2016, 08:22 PM   #4
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Is there a bypass when connected to city water? Or is it best to have the pump switch on in case the campgrounds water pressure is low?


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Old 05-04-2016, 08:33 PM   #5
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Is there a bypass when connected to city water? Or is it best to have the pump switch on in case the campgrounds water pressure is low?


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There is no bypass. The city water simply connects to the pumps output (there is a check valve so the pump doesn't back feed into the tank) and from there the line goes to the water filter (if you have one internally) and from there on to the hot and cold water lines. You can leave it on if you want but you will need some water in the tank if it is to do anything.
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Old 05-05-2016, 12:40 PM   #6
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Turn it off.
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Old 05-05-2016, 01:28 PM   #7
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Turn it off. You only need it if you have water in the fresh water tank. City connection bypasses the water pump therefore, the pump is useless when hooked to city water. If you put water in the tank and city water should shut down, then you can turn on the pump to get water from the tank.

If you turn the pump on without water in the tank, the pump will run forever trying to suck up water that isn't there.
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Old 05-05-2016, 01:47 PM   #8
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Thank you all!


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Old 05-05-2016, 02:00 PM   #9
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When you run city water, I highly recommend using a pressure regulator. Sometimes the pressure coming out of the city water connection can greatly exceed the pressure limits of your RV's plumbing.
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Old 05-05-2016, 02:02 PM   #10
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Just goes to show that there are NO simple questions.

The way properly working check valves function is that when there are two sources of water pressure, the source with the highest pressure supplies the water.

So, how does that effect your question, you ask?

Suppose you are at a campground with questionable water pressure.
Suppose further, you fill your fresh water tank and turn on your water pump.

Normally, the campground water pressure will be higher than your water pump's turn on pressure. The pump will stay off, the check valve inside the pump will prevent city water pressure from filling your fresh tank to overflowing.

However, any time the campground water pressure drops below the water pump's kick in pressure, and maintain pressure in your plumbing during the campground pressure sag. This will allow your shower to remain uninterrupted by screams and curses.

We highly recommend this procedure at the International Rally in Goshen, where in the fields up to 16 campers can being fed from a single 3/4 inch water main) filling your fresh water tank on arrival and keeping it full with the water pump running is just a good precaution.
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