Originally Posted by Herk7769
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.
First I hooked up to city water after filling my fresh water holding tank.
Then the pressure seemed low into my trailer so I turned the pump on. It kicked on as I used the sink etc and it drew from the holding tank based on the drop in water level.
I do have a water pressure regulator installed at my connection.
Rich in Massachusetts
2016 Roo 233S
2013 Ford Explorer XLT
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