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Old 09-28-2010, 04:02 PM   #1
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Can't use all fresh water in 2006 Discovery

We recently purchased a 2006 Discovery 39S. This past week end (4 days) we camped at a state park with no water hookups. I filled the fresh water tank. The entire time we had a lot of air in our water supply. Usually you get some air in the beginning then it clears out. The pump would run a lot before it finally built up pressure to quit. Checked the bypass valve to make sure it was closed all the way. Also checked the filter mounted on the pump and it was fine.

Then when the fresh water tank sensor indicated we were down to 1/4 tank we ran out of water. None would run down to the pump. I know the sensor indicates empty when the tank is empty so don't think that's an issue. Besides the grey tank never filled up beyond 3/4 and it's considerably smaller than the fresh tank. So I know there is a lot of water left that we can't seem to use. Now I know those tanks are long and shallow, so tried changing the level on the MH to see if anything would get the water to run into the pump. Nothing worked. Any suggestions would be appreciated. This forum is great.

Jack
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Old 09-29-2010, 10:25 AM   #2
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Find the water pump and see if it has a inlet strainer - most do. It may be clogged with debris from the tank. e.g. curls of plastic left over from holes drilled at the factory.
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Old 09-30-2010, 08:46 AM   #3
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I checked the inlet strainer, it is clear. Interestingly when I unscrewed the strainer no water flowed out. So the 1/4 tank of fresh water that remains is not getting to the water pump. Anyone know where the fresh water tank is located in the Discovery? It's easy to see the grey and black tanks but so far haven't been able to locate the fresh tank.

Jack
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Old 09-30-2010, 11:05 AM   #4
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Definitely sounds like you're sucking air, somewhere between the tank and the pump. As the water level goes down, the pump has to work harder to pull the water up. It's easier to suck air than water so when it got to that point, all you get is air. To find the tank, try and follow the gravity fill line to the tank.
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Old 10-05-2010, 08:43 PM   #5
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Quote:
Originally Posted by jshidemantle View Post
I checked the inlet strainer, it is clear. Interestingly when I unscrewed the strainer no water flowed out. So the 1/4 tank of fresh water that remains is not getting to the water pump. Anyone know where the fresh water tank is located in the Discovery? It's easy to see the grey and black tanks but so far haven't been able to locate the fresh tank.

Jack
Its easy to get to the fresh tank, Its In the driver side, open the drivers side slide and there Is a cover on the frame rail pull that cover out and the tank Is In there, If you can't find It let me know, Joe.
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Old 10-07-2010, 11:46 AM   #6
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I put the driver side slide out but did not have enough room to crawl under the coach. I assume the tank is above the frame rail which would be above and slightly behind the propane tank. It didn't look like anything was removable to view the tank. I need to crawl into the water utility compartment so I can view what's behind the panel with the valves on it. Maybe I have a loose connection there that is causing air to be sucked in. The pump is mounted on the compartment wall just to the left of the water panel compartment.

Jack
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Old 10-09-2010, 01:03 PM   #7
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On mine is all the way the front right above the frame rail and rout over the fuel tank you really have to look or you might not see it it took me a wile to find it
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Old 10-10-2010, 06:15 AM   #8
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My fresh water tank is between the frames of the chassis in a heated compartment. Access to mine is on the right side of coach through one of the baggage compartments. Mine has a flap that flips up and you can see all of your tank their. It also has a drain port their to drain water for winter.
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