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Old 01-09-2024, 06:04 PM   #1
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Water pump wont stop running when water is low

My water pump does this weird thing, when water is low, not empty it will just run, a little quieter than normal but it won't stop untill i turn the pump off. There have been times i towed the trailer and when i got home the pump was just going, probably the whole trip back. This last trip i added 6 gallons of water on the last day and i could get the dam pump to stop even after adding the water.

The pump is only a couple years old.

Any idea as to why it does this and how to fix it?
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Old 01-09-2024, 06:41 PM   #2
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The water pump is designed to run until it builds up enough pressure to turn itself off. It has an internal pressure switch. It could be possible it got air in the water lines which prohibit building up enough pressure.

You could try to purge the air from the water line and see if it solve the problem.
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Old 01-09-2024, 08:58 PM   #3
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It sounds like the pickup tube isn't sitting on the bottom of the tank.
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Old 01-09-2024, 09:15 PM   #4
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Quite likely there is "crud" in the check valve in the pump and it will not build up enough pressure to shut off, as it the water is leaking back. Take apart and clean. By the way, NEVER leave your pump in the "on" position when towing!! Have seen kitchen valve open and fill the sink and overflow onto the floor! If the pump has run for hours, possibly it is ready for the replacement.
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Old 01-09-2024, 10:08 PM   #5
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This is all good info! Thank you!

How would i purge the air out of the line?
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Old 01-10-2024, 08:41 AM   #6
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Air is purged out of a line by pumping water through it! Putting water in the tank, turning on the pump, and opening each and every valve in kitchen, bath, shower, outside shower (if applicable) and low point drains, until water comes out without any air is how to purge the system of air.
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Old 01-10-2024, 08:49 AM   #7
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I am surprised no one has mentioned this, but you should always turn off your pump before traveling. You are flirting with a flooding disaster by leaving the switch on while driving if you have water in your fresh tank.
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Old 01-10-2024, 09:06 AM   #8
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Angry

Quote:
Originally Posted by CBWELL View Post
Quite likely there is "crud" in the check valve in the pump and it will not build up enough pressure to shut off, as it the water is leaking back. Take apart and clean. By the way, NEVER leave your pump in the "on" position when towing!! Have seen kitchen valve open and fill the sink and overflow onto the floor! If the pump has run for hours, possibly it is ready for the replacement.
Been there done that. Fool me once……….never make the same mistake twice and all that stuff
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Old 01-10-2024, 09:08 AM   #9
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I had that problem once only to find out the cap on the small inline filter on the inlet side of the pump was not sealing properly. Lucky I had a spare
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Old 01-10-2024, 09:21 AM   #10
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Quote:
Originally Posted by CBWELL View Post
.... By the way, NEVER leave your pump in the "on" position when towing!! Have seen kitchen valve open and fill the sink and overflow onto the floor! If the pump has run for hours, possibly it is ready for the replacement.
Hi

Your first clue this has happened just might be that wall of water that greats you as you open the door to the trailer .... I have empirical data on this ...

Back on topic ....As water gets low, the feed to the can suck air rather than water. That's just how this stuff works. When sucking air, the pump is not going to be happy.

Bob
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Old 01-10-2024, 09:47 AM   #11
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Quote:
Originally Posted by CRH View Post
It sounds like the pickup tube isn't sitting on the bottom of the tank.
^this. Let us know what you find.
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Old 01-10-2024, 10:31 PM   #12
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Yep!

Great advise How would we know it can bump on and overflow into the kitchen sink then drawers then floor. One of the very few times I’ve head words from my spouse when she opened the door and water poured out. We installed a IRVWPC module just so we had a backup setting to turn the pump off if we forget the switch. And a sink handle tie off and we leave the sink drain open and notes everywhere to turn off the pump!

Quote:
Originally Posted by CBWELL View Post
Quite likely there is "crud" in the check valve in the pump and it will not build up enough pressure to shut off, as it the water is leaking back. Take apart and clean. By the way, NEVER leave your pump in the "on" position when towing!! Have seen kitchen valve open and fill the sink and overflow onto the floor! If the pump has run for hours, possibly it is ready for the replacement.
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Old 01-11-2024, 12:38 AM   #13
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All of the advice above is potentially correct, there are multiple things that can cause this. I want to add one more (my personal experience.)

On my '17, someone in the factory cut the pex that runs up from the fresh tank a bit too short. That meant that the line running horizontally toward the pump was putting a little upward pressure on the 90-degree fitting between it and the vertical line, which eventually developed a tiny crack. I knew something was sucking air from the way the system behaved, but didn't find it until the crack expanded and I got almost NO water coming up from the tank. On a weekend when we didn't have water hookups. FUN!

It was even more fun to fix, because it was super hard to work with the too-short line down in a hold under the cabinetry. I ended up doing a little "modification" that's a hack but it's held up for 3 years so far! (knock on wood!) Anyway, when the crack was still too tiny for me to find, the system behaved like you're describing. The lower the water level in the fresh tank, the harder the pump had to pull to lift the water up to the pump and the more air it sucked in through that little crack and caused the pump to run long or not stop at all.
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Old 01-14-2024, 10:48 AM   #14
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Quote:
Originally Posted by jackvosney View Post
My water pump does this weird thing, when water is low, not empty it will just run,.........
OR your water quantity indication is incorrect, and the pump is sucking air from the
empty tank. Or a combination of intake to high and tank quantity incorrect. Check water tank level by draining tank when this condition is reached.
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Old 01-14-2024, 12:01 PM   #15
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You can also install this "intelligent" device:

https://www.irvwpc.com
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Old 01-14-2024, 12:11 PM   #16
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You can also install this "intelligent" device:

https://www.irvwpc.com
I agree. This has proved to be a good investment for us!
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