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Old 10-10-2016, 05:59 PM   #1
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Water pump will not pressure up

When I winterized the water system I could not get the water pump to pressurize and stop it kept continually running.

The background story to the problem is as follows:
We were camping without any services and ran out of waster on the last night and ended up with some air in the lines. So had to put 5-10 gal in the tank for the next day. During the night our 2 fully charged (have generator) 6v deep cycle battery were dead. I did not hear the pump running through the night.

Fast forward 2 weeks when I was winterizing the RV.
Before I tuck the trailer away for the year I double rinse the grey, black, and galley. Started putting the antifreeze in the lines. This is when the pump would not pressure up. Also when the pump was running their was antifreeze coming in to the toilet. The toilet is a Thetford Aqua-Magic STYLE II.

Are the issues related?
Or is it just a coincidence and they are two separate ones?
Does the water pump need to be replaced?
Is it easy to replace the o-ring that I think is the problem with the toilet.
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Old 10-10-2016, 06:19 PM   #2
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Two possible problems. First, leaking out the toilet could cause it to not build enough pressure to shut off. Second, mine wouldn't prime after I blew the lines out until I opened up a few faucets. I guess the air built enough back pressure to prevent the pump from pulling out of the tank.
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Old 10-10-2016, 06:33 PM   #3
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On our present and past rigs, two completely different water pumps, it was amazing how air in the lines would prevent the pump from fully pressurizing and stopping.
"Fix" seems to be bleeding all the air out of all the lines ... which of course doesn't do a "darn" bit of good when you are trying to winterize / antifreeze the system.
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Old 10-10-2016, 08:39 PM   #4
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I am not concerned about the winterizing. I was able to put a total of 6 gallons of antifreeze into the entire system. So there is enough of it in the water lines even with some air.

So in the spring I will try using the fresh water tank to flush the antifreeze from the system.

Is it an easy repair to change the o-ring in the toilet?
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