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Old 05-31-2014, 08:45 PM   #15
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The good news is that if my theory is correct, the problem is all but meaningless in a practical sense so long as the heater is full of water and purged of excess air when heating.
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Old 05-31-2014, 08:52 PM   #16
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That would be possible if the pump failed and there were no pressure in the system.

That is not the condition presented.

There was reported pressure on the system that caused flow from a faucet.

I would ask for Clarification on the position of the trailer before we continue on the holding tank issue.
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Old 05-31-2014, 08:53 PM   #17
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Quote:
Originally Posted by J. Morgan View Post
The good news is that if my theory is correct, the problem is all but meaningless in a practical sense so long as the heater is full of water and purged of excess air when heating.

Which theory are you referring to?
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Old 05-31-2014, 08:55 PM   #18
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I gathered that the pump was off for an extended period of time, no pressure for some time.

The pump could leak if there is even a small piece of debris affecting a valve.
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Old 05-31-2014, 09:03 PM   #19
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Perhaps the op can clarify, but my understanding is that he found water under the fill port for many days, and that upon turning the pump on it ran for a significant period of time before it made pressure and shut off.

My hypothesis was predicated on;

1. A fairly significant amount of water leaked from the trailer over many days.

2. Upon turning the pump on seemingly water went somewhere before the system met pressure. ( it could be that the pump lost prime, but when taken with point 1. Above...)

3. The water that leaked came from somewhere.

4. The water the pump pumped upon being switched on went somewhere.

5. Is there another resivoir other than the hot water tank in the camper big enough?
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Old 05-31-2014, 09:13 PM   #20
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My very brief internet education on the expansion rate of water indicates that a rise in temp of about 25C might cause water to expand in excess of 1%.
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Old 05-31-2014, 09:49 PM   #21
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Thanks everyone, for your input.

To clarify, I'm not hooked up to city water. The trailer is fairly level--as level as it ever is in the driveway--and it's never done this before.

The hot water tank theory may have some merit; while I dewinterized the rest of the system before our last trip, I only dewinterized the hot water tank after it, coinciding with the rest of the issues.

While I think this is a viable theory, how do I check it?

Thank you, again.

Meg
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Old 05-31-2014, 09:54 PM   #22
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perplexing water pump issue

Did air come out of the hot water taps when you tried the pump?

If so this would tend to validate the theory.

If the theory is right about what happened , it may not happen again, but if it does, it might not really matter in a practical sense, (other than most of the five to ten gallons of water your hot water heater holds slowly leaking out in your driveway)
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Old 05-31-2014, 09:56 PM   #23
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Turn the pump on and draw water using a hot water faucet till you do not get air slugs. Now the heater is full of water.

You have also drawn down the level in the fresh water tank.
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Old 05-31-2014, 10:07 PM   #24
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perplexing water pump issue

I think the only way to really check for this issue is to try and duplicate the prior conditions.

I think the chances are better than even that it won't reoccur.

In my thinking, the winterizing of the unit plays into my theory, unless you only filled the hot water heater after the leaks on the driveway, if this is the case it totally negates my theory, and it would make the single event of the driveway drips and the pump taking a long time to make pressure separate and unrelated events.

This would explain the slow build of pressure, but then the driveway drips would still be a mystery.
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Old 06-01-2014, 10:32 AM   #25
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Went out this morning, turned on the pump and the hot water at both faucets--pump ran about 70 seconds before turning off--lots of air expelled from lines. Pump seems to be operating normally now.
Thank you all for your suggestions. Hopefully this issue is resolved.
Meg
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