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Old 06-02-2023, 01:02 PM   #1
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Pump burps

Good day everyone.
We have a 2021 Outdoors RV 20BD which we purchased new. Right out the gate we noticed our water pump burps occasionally, as new RV owners we assumed the burps were normal. Inside under bathtub - dry, same in main cabin area and under both sinks. No dripping faucets. Our hot water relieve valve on the outside does drip.

We have dropped the coroplast to do some work and noticed it is wet - not pour in your face wet but condensation type wet.
Do we have a potential leak somewhere other than hot water relieve valve thats causing wet/moisture in underbelly and/or pump burps?
Thank you!!
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Old 06-02-2023, 01:20 PM   #2
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Leaking fresh water would have little to no smell unless it's been going on for a long time. It also would have no slimy feel. Leaking drains on the other hand will definitely smell and will more than likely contain slimy soap residue. You need to start by replacing the water heater T&P relief valve. Good luck!
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Old 06-02-2023, 01:25 PM   #3
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Pump short cycling when no one is using water ....that is a LEAK

Low point drains,
water line connections to WH Tank/Faucets/Showers (those are usually only hand tightened by floor jockey doing the installs), crimped fittings on any 'T's/Elbows/line connectors,
WH Tank Relief/Drain Plug, toilet water inlet valve, etc


You have a LEAK....minor depending on frequency of pup short cycling
The shorter the span the larger the leak (system pressure has to drop low enough to make pump pressure switch close/start pump)

I found a 'T' crimp leaking behind a false wall and hard water stain on it.

Wet insulation in underbelly....doubt it is condensation. More likely a small leak from fitting dripping

Placing sheets of Toilet Paper On/Around suspect areas/fittings will show slow leaks.
Good luck!
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Old 06-02-2023, 01:27 PM   #4
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Burps out of the water faucets could be nothing more than air in the water lines - which happens if you drain your freshwater tank or disconnect from city water.

PT valves in MoHo/RV water heaters are known to drip. Try lifting and closing the lever a few time while the water heater tank is seeing water pressure from either your pump or when the coach is on city water. If it doesn’t quit, replace it. DO NO INSTALL A PLUG IN ITS THREADED OUTLET!

Condensation above the coroplast would be unusual unless your in an area that sees colder nights and high humidity (and even then it would be unusual).
You need to determine if moisture accumulation is more in one area than others as condensation would tend to be more evenly distributed all over the area.

You need to be looking at all your freshwater plumbing while under pressure, paying close attention to all fittings.
It’s harder to test your drain plumbing, but it could be leaking somewhere as well. Inspect it closely at each and every joint, looking for where dirty water may leave a dirt trail on the black piping.
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Old 06-10-2023, 11:38 AM   #5
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The water pump could be leaking internally, loosing pressure, then cycling to pressurize. Ours burped for years till I finally replaced it. Although, I would be very concerned about moisture above the coroplast. Check your outdoor shower to. Good luck.
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Old 09-07-2023, 10:53 AM   #6
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Sorry for huge delay in updating thread. Between family trips, no internet and just generally having fun. We have discovered that the pump burp stops when we turn off hot water heater. Could this be related to the relief valve?
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Old 09-07-2023, 11:02 AM   #7
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Quote:
Originally Posted by camping-mama View Post
Good day everyone.
We have a 2021 Outdoors RV 20BD which we purchased new. Right out the gate we noticed our water pump burps occasionally, as new RV owners we assumed the burps were normal. Inside under bathtub - dry, same in main cabin area and under both sinks. No dripping faucets. Our hot water relieve valve on the outside does drip.

We have dropped the coroplast to do some work and noticed it is wet - not pour in your face wet but condensation type wet.
Do we have a potential leak somewhere other than hot water relieve valve thats causing wet/moisture in underbelly and/or pump burps?
Thank you!!
Quote:
Originally Posted by camping-mama View Post
Sorry for huge delay in updating thread. Between family trips, no internet and just generally having fun. We have discovered that the pump burp stops when we turn off hot water heater. Could this be related to the relief valve?
Water Heater T&P Relief Valve dripping..........that is a leak
T&P opens at 210*F/150psi .... can weep at 120 psi

Water SWELLS when heated.......loss of air pocket in top of WH Tank can cause weeping due to pressure increases
The air pocket acts like an expansion tank. Water being uncompressible will rapidly increase in pressure when heated.

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Old 09-07-2023, 12:39 PM   #8
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And as it approaches freezing at 32 degrees F.
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Old 09-07-2023, 09:19 PM   #9
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Originally Posted by TandW View Post
And as it approaches freezing at 32 degrees F.
True........but if it swells from freezing inside the Water Heater Tank
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Old 09-07-2023, 10:24 PM   #10
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I had a similar pump cycling problem. Rebuilt pump, didn't fix it. Looked everywhere for a leak. Finally found the white hose on the discharge side of the pump where it connects back to the PEX was loose and barely leaking. Never really dripped anywhere as I kept pump off at night and when we were gone. I took the hose clamp off and put the correct size oetiker clamp on it. That ended problem.

FYI, I did go one step further and installed a variable speed pump controller https://www.irvwpc.com/. That really improved pump operation matching pump speed to demand of faucet that is on.
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