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Old 10-20-2016, 05:32 AM   #1
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Water pump intermittently runs

Water pump is working fine,but intermittently it fills with water every 40-50 minutes for about 2 seconds .has anyone else have had this happen to them. I cannot detect any leak of any kind. A possible drip from from the water fill inlet ? Air leak from the pump? I have no problem when connected to city water
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Old 10-20-2016, 06:50 AM   #2
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Either a small leak somewhere that you haven't found or the check valve in the pump. If the check valve fails it allows water on the pressurized side of the pump to leak back into the freshwater tank. Eventually the pump detects low pressure, runs for a few seconds and you're back where you started.
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Old 10-20-2016, 06:55 AM   #3
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Mine started doing that and the frequency of it coming on increased. Finally found a leak in the water heater compartment. The water heater developed a pin hole leak in the welded seam. Had to pull water heater and disassemble to find. Decided to replace in stead of taking chance of another leak.
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Old 10-20-2016, 07:16 AM   #4
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I had a similar problem on mine. It turned out to be the tank fill valve in the water compartment. The one I can use to fill the fresh water tank when hooked up to city water. It was leaking back into the water tank so no visible leaks. Had the valve replaced and no more problems. Good luck with your problem.

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Old 10-20-2016, 07:29 AM   #5
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I had a similar problem on mine. It turned out to be the tank fill valve in the water compartment. The one I can use to fill the fresh water tank when hooked up to city water. It was leaking back into the water tank so no visible leaks. Had the valve replaced and no more problems. Good luck with your problem.

Don
mine is similar if not fully in the correct position for house water tank
exercise it and see if it corrects itself
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Old 10-20-2016, 10:05 AM   #6
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Our leak proved to be the city water fill valve needed a 1/4 turn to tighten it. The Connection was not visible but the valve was easy to tighten with a turn after I unscrewed the attaching collar. Unfortunately water had leaked long enough to cause sone wood rot under the shower. The lesson is you must find out the reason and fix it or it may cost considerably more later.
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Old 10-20-2016, 11:04 AM   #7
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The lesson is you must find out the reason and fix it or it may cost considerably more later.
Amen!

I did some work on our pump last Fall installing a winterizing valve, which also required moving the pump and adding some plastic water line. I also installed a water heater bi-pass. Later I noticed the pump doing basically what your is doing and knew that I needed to start looking for a leak, probably a result of the work I had done. In the meantime, to reduce the amount of leakage/damage, I would turn the pump off when we didn't need it, especially at night. During my hunting trip a few months ago I needed to remove some items that had been stored under the bed near the water pump and the bottom of the plastic bag was wet. Now I know where the leak is, I just have to fix it.

Best of luck finding yours.

Steve
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Old 10-20-2016, 11:19 AM   #8
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Originally Posted by sdrtile View Post
Water pump is working fine,but intermittently it fills with water every 40-50 minutes for about 2 seconds .has anyone else have had this happen to them. I cannot detect any leak of any kind. A possible drip from from the water fill inlet ? Air leak from the pump? I have no problem when connected to city water
sdrtile
If you can find no water leak....an "internal leak", (in the pump diaphragm, or in the pressure switch on the pump), will cause that.
Rebuild kits and new pressure switches are available for most RV water pumps...Google "XXX water pump parts"... replacing the Xs with the make and model number of your water pump.
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Old 10-20-2016, 02:03 PM   #9
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It's unlikely, but I just wanted to throw this out there as a possible alternative answer...

Do you have an automatic ice maker? The 45-50 minute timing sounds just about right for making ice, and it would run the pump for about 2 seconds to refill the trays. That's just about how ours works, so that's why I mentioned it.

I hope it's something this simple. Good luck!
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