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Old 09-11-2018, 01:50 AM   #1
Senior Member
Brand: Still Looking
Model: Newmar Bay Star Sport 300
State: Alabama
Posts: 2,112
THOR #6826
Water pump behaving badly...

So my water pump has taken up a strange habit. After any faucet is turned off the pump will run for less than one second repeating every 12 - 20 seconds. Used to happen only occasionally now itís pretty much all of the time. Sometimes it stops after 4 or 5 ďburpsĒ, sometimes it goes on (and on, and on!). Sometimes turning the pump off and back on with the switch will stop the process. itís very annoying and canít be doing the pump any good either. I donít think the system pressure is bleeding off enough to trigger the pump and certainly it doesnít run long enough each time to generate much pressure.

Does anyone have any ideas or suggestions?

Thanks much.

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Old 09-11-2018, 01:54 AM   #2
Axis/Vegas Enthusiast
JamieGeek's Avatar
Brand: Thor Motor Coach
Model: Axis 24.1
State: Michigan
Posts: 8,672
THOR #1150
Perhaps one of its valves aren't sealing and its letting water go back into the tank; might be time for a new pump in that case.

Is a valve open letting water onto the ground (low point drain or something)?

2014 Thor Axis 24.1
2018 Chevy Bolt
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Old 09-11-2018, 02:12 AM   #3
Senior Member
Brand: Thor Motor Coach
Model: Hurricane 29M
State: Texas
Posts: 881
THOR #11781
I had that problem on my last coach. The culprit was the city water connection.
Lt Keefer
2018 Hurricane 29M
CHF, Saf-T-Plus, SumoSprings
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Old 09-11-2018, 02:56 PM   #4
Brand: Thor Motor Coach
Model: ACE 32.1
State: Michigan
Posts: 85
THOR #11442
If the above recommendations check good then check the fittings on the inlet side of pump for tightness. Check the strainer for debris. A clogging strainer can induce pump cavitation.
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Old 09-15-2018, 01:50 AM   #5
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Brand: Thor Motor Coach
Model: Miramar 34.4
State: Iowa
Posts: 665
THOR #4488
I second the pump strainer. Remove, clean and reinstall hand tight.
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