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Old 05-20-2015, 10:22 PM   #1
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Weird water pump occurence

So I'm getting ready for this weekend's trip, and I fill the water tank. I flip on the pump to purge the air out of the lines. I can hear the pump is running, but it's not making it's normal sound or pitch. I open a tap and nothing--no pressure, no flow. The HWH is full, so it's not like there was an air pocket or anything preventing flow. I open every tap, hot and cold, and nothing, but the pump is still humming. So I open up my winterizing panel, uncap the antifreeze tube (which would seem to allow air to be sucked into the system,) and voila--the pump's pitch changes, pressure builds, and then the pump stops. I open the tap, and I have pressure/flow, pump kicks on again like it should. So what the heck was going on? It's like it couldn't get primed--almost felt like vapor lock on an old carburated V8. Thoughts? Is my pump on the way out? TIA...
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Old 05-20-2015, 10:48 PM   #2
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You said you uncapped the antifreeze tube but don't you also have a selector valve to switch between the antifreeze tube and your holding tank as an input to your pump?
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Old 05-20-2015, 10:52 PM   #3
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If uncapping the antifreeze tube allowed air to be sucked into the system, you had the winterizing valve in the winterizing mode.
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Old 05-20-2015, 11:12 PM   #4
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Pretty sure the winterizing valve is set to the use position...I dry camped last month for a weekend, used water no problem, pump worked fine, and I haven't changed any settings. I'll double check it tomorrow, but I think it's set correctly.

I know, it doesn't make sense...
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Old 05-20-2015, 11:27 PM   #5
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Taran,

I have had this happen as well. The winterizing valve in may case was closed. I forced water to prime the pump by filling the tank using overfilling pressure to force prime the pump. I guess the vapour lock comment is very valid as well, the antifreeze valve might be partially open and this is causing lack of prime.
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Old 05-21-2015, 06:37 AM   #6
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I too have had this issue and I do not have the winterizing valve. I open one of the low point drains to solve it when it happens.
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