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Old 04-13-2015, 06:10 PM   #1
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Water pump runs during the night

Our water pump seems to have a mind of its own lately and turn itself on even if no faucets are open. Can anyone explain why?

Thanks
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Old 04-13-2015, 06:14 PM   #2
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You either have a very slow drip at one of the faucets, a drain valve dripping, toilet valve passing water into the toilet, or the check valve in the pump is not holding. Could be any one or a combination. I would check the pump to see if it is the check valve with a bit of grit first. Good luck, Chris
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Old 04-13-2015, 07:13 PM   #3
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Mine does that sometimes. Maybe once a night. I've never found a leak.
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Old 04-13-2015, 08:30 PM   #4
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Why not just put in a switch to kill the power at bed-time?

Assuming this only happens when you are boondocking? On our '74, the pump is not needed when we're on city water...
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Old 04-13-2015, 08:43 PM   #5
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I only turn my pump on when I need it, then turn off, weird little habit.
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Old 04-13-2015, 09:16 PM   #6
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If the pump is coming off and on, then the pressure must be dropping. Since it is not a leak, it must be the check valve going weak. They don't seem to 'totally fail'.. but instead just 'leak/bleed down'.

I also turn off the pump until I need it.. One 'flood' is all I need..
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Old 04-13-2015, 09:21 PM   #7
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We had a pump that did that until it slowly died. Replaced it with a new one rather than trying to figure out what was wrong.

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Old 04-13-2015, 09:30 PM   #8
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if the water pump turns itself on during the night, chances are it will during the day too. As the others have said, it may be a leak inside the pump. Mine had such a leak on our first camping trip. Also when we were hooked up to City water, water would leak out the other side of the trailer through the fresh tank overfill. It turned out that the same internal leak to the pump was causing both problems. My leak was a lot worse than yours however - the pump came on every 60 seconds or so, for only a second or 2 to re-pressurize the system. I installed the new water pump myself rather than take the trip back to the dealer or factory. Now that was fun! Good luck on tracking down the cause and with the fix.
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Old 04-13-2015, 10:01 PM   #9
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Ours has been doing that since new. Pressure leak somewhere.

Since we boondocks most of the time. Turning off the pump when we don't need water is just one of the things we do not to burn elec.

Also only turn the water heater on when we plan on wanting hot water.
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Old 04-13-2015, 11:08 PM   #10
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Our pump has not come on by itself, but we do leave it on during regular inspections of the systems to ensure the plumbing is tight. Otherwise we turn it and the water heater off at night, or when not being used during the day.

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Old 04-14-2015, 07:26 AM   #11
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I guess this is just another instance of my anal retentive perfectionist coming out. Water systems should be completely free from leaks of any sort. I'd also suspect the pump check valve, but I couldn't accept it and turn the pump on and of. I'd have to fix it.
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Old 04-14-2015, 10:43 AM   #12
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They sometimes do come on as a result of the water pressure dropping as the water cools, especially if you shut off the water heater at night.

Cold water is less dense, takes up less room, so the pump runs.

It's the flip side of the situation where you can sometimes end up with the relief valve dripping a little bit as the water heater heats up.
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Old 04-14-2015, 11:56 AM   #13
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Quote:
Originally Posted by Jammer View Post
They sometimes do come on as a result of the water pressure dropping as the water cools, especially if you shut off the water heater at night.

Cold water is less dense, takes up less room, so the pump runs.

It's the flip side of the situation where you can sometimes end up with the relief valve dripping a little bit as the water heater heats up.
Actually, cold water is more dense - to a point and takes up less room - to a point.

The density of water is greatest at about 42 degF. As you get colder, the water will expand - and break pipes if a suitable pressure relief is not found, or the pipes are kept warm.
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Old 04-14-2015, 12:55 PM   #14
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If the pump is coming on YOU HAVE A LEAK.

My system will hold pressure for several days and I do that every spring to ensure I have not developed a leak.

A leak will eventually rot the floor. My daughter never used her pump, city water every time, and after the front of the trailer rotted off the floor I discovered the leak was on the output side of the pump. While hooked up to city water it just dripped for 4 years. Never enough to drip on the ground over a weekend just saturate the floor.

Find it now or fix it later.
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