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Old 09-23-2017, 03:16 PM   #1
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Gray water over flows

On city water the gray Water tank slowly fills without the faucets being on. How can this happen. No one seems to know. help! ACE 29.2 2012
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Old 09-23-2017, 03:46 PM   #2
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Most likely it is bad water pump. Most water pumps have a back flow preventer that stops city water from flowing in reverse thru pump. Remove suction hose from pump and there should not be any water coming out of pump when city water is connected. Get mfg and model number and check on line - there probably is a rebuild kit. Or 1. buy new pump or 2. add cutoff valve between pump and tank.
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Old 09-23-2017, 03:55 PM   #3
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Most likely it is bad water pump. Most water pumps have a back flow preventer that stops city water from flowing in reverse thru pump. Remove suction hose from pump and there should not be any water coming out of pump when city water is connected. Get mfg and model number and check on line - there probably is a rebuild kit. Or 1. buy new pump or 2. add cutoff valve between pump and tank.
How is the water pump connected to the grey tank?
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Old 09-23-2017, 04:04 PM   #4
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Is it possible you mean the blank tank? Could you be hooking the hose up to a black tank flush system?
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Old 09-24-2017, 11:19 AM   #5
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Gray tank overfill

Thanks for info, but if it is the water pump wouldn't the water back up into the fresh water tank and not the gray water tank? How is it connected to the gray?
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Old 09-24-2017, 11:23 AM   #6
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We do not have a flush system on this model. Just a single city water connection.
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Old 09-24-2017, 04:12 PM   #7
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How is the water pump connected to the grey tank?
My bad no coffee before reading. Grey - key word. Sorry. Does the same thing happen when city water disconnected, pump is on and water in fresh water tank? Is there a RO/reverse osmosis system installed. RO system will do exactly what you say is happening. Are you the original owner? Previous owner or service tech's may have done something really weird.
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Old 09-24-2017, 04:56 PM   #8
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Welcome!! We have the 29.2 2013, we purchased it new from Camping World. Our water pump was replaced the third year we had it. We also removed the macerator...we have not had your problem with the gray tank filling while connected to city water. Does it happen when you are not connected? By the way the bathroom sink empties into the black tank...
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Old 09-25-2017, 05:15 PM   #9
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My bad no coffee before reading. Grey - key word. Sorry. Does the same thing happen when city water disconnected, pump is on and water in fresh water tank? Is there a RO/reverse osmosis system installed. RO system will do exactly what you say is happening. Are you the original owner? Previous owner or service tech's may have done something really weird.
Thanks so much. I am the original owner. I have never heard of RO reverse system. I do not think I have one on an ACE.
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Old 09-25-2017, 05:26 PM   #10
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ctpres may have been onto something IF your freshwater tank overflow goes to your gray tank, which I have never seen. As far as I know, the only inputs to your grey tanks are drains from sinks and showers. Just for grins, what is the status of your FW tank when this happens?

Is it possible your shower connections are leaking behind the wall and draining down the wall into the shower pan?
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Old 09-26-2017, 03:08 AM   #11
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On city water the gray Water tank slowly fills without the faucets being on. How can this happen. No one seems to know. help! ACE 29.2 2012

Did this problem start recently or has it been this way since new?

Does the grey tank slowly fill when running only the water pump and no city hookup? If so the pump should be cycling on and off when not using any water. This would indicate a leak somewhere.

If it only fills with the city water hooked up then the problem is between the city hook up and the pump. What that could be is beyond me.
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Old 09-26-2017, 09:55 AM   #12
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A picture or two of the wet bay showing valves and hose connections might be helpful. When you remove cap to dump is there any liquid. Possible both black and grey dump valves not fully closed or leaking. Only other normal fresh water connection to grey tank would be tank flush system and you don't have that. Hang in there - it is fixable and a real challenge to figure out.
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Old 09-26-2017, 02:56 PM   #13
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ctpres may have been onto something IF your freshwater tank overflow goes to your gray tank, which I have never seen. As far as I know, the only inputs to your grey tanks are drains from sinks and showers. Just for grins, what is the status of your FW tank when this happens?

Is it possible your shower connections are leaking behind the wall and draining down the wall into the shower pan?
I just filled the fresh water and everything works as normal. No problem and pump does not recycle.
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