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Old 08-20-2016, 09:03 AM   #1
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Fresh water dumping into black tank?

This is our second trip in our Eagle 5th wheel and we've had nothing but water problems since we got here! We checked the water pump and filled the tank before we left, everything was working perfectly and there was great pressure. Now the pump won't run, water sputters out of the faucet every so often then it's off again and it seems our fresh water tank is draining directly into the black water tank. Any ideas on how to fix this?
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Old 08-20-2016, 09:42 AM   #2
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Are you dry camping?

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Old 08-20-2016, 09:43 AM   #3
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Post a picture of your valves so we can make sure they are set properly.

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Old 08-20-2016, 09:45 AM   #4
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Do you have a freshwater hose connected to your tank washer by mistake?

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Old 08-20-2016, 09:45 AM   #5
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Sorry to hear of your challenges. There are a couple of things to look at. Did you overfill the tank? Some units when the tank gets overfilled the water coming out the spout creates a siphon effect and actually drains a significant portion of the fresh water. Is it possible a faucet was open and running while you travelled?

Your question about draining directly from the fresh tank to the black... There is no direct connection between the two there are only two sources of water to enter the black tank. The first is through the toilet and the second is through the black tank flush. On most new rigs it seems the black flush is right next to the fresh fill and the two ports are very poorly labelled. Based on your question I wonder if you filled the black tank instead of the fresh tank... You would not be the first or the last on this forum to do this.

Good luck!
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Old 08-20-2016, 09:46 AM   #6
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It may not be draining into the black tank but as many Jayco owners have discovered the fresh water tank tends to siphon itself out its own overflow tubes to the ground while driving. Many owners have installed shutoff valves.

The other issue of no water at the tap could be either that all of it has drained out as mentioned, or my thought is that there could also be a leak between the fresh water tank, pump, and tap(s). I would start by checking the lines and fittings in the wet bay with a tap on and a confirmed amount of water in the tank.
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Old 08-20-2016, 10:00 AM   #7
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We had a full water tank and empty black water when we arrived. Now we have a nearly full black tank and a nearly empty fresh tank. When the pump is on, it's running water(very quietly unlike when you turn on a faucet/flush the toilet) like it's filling up the hot water heater but we shut that off and figured it was just building pressure to the lines but then no water at all was coming out of the faucets. All faucets were off while we were driving as well. We're taking it into the dealer when we get back to see what's going on and to fix the rear stabilizers too.
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Old 08-20-2016, 10:01 AM   #8
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Is your toilet valve stuck partially open?

Also don't necessarily trust your black tank sensors.

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Old 08-20-2016, 10:03 AM   #9
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Quote:
Originally Posted by KThygesen View Post
We had a full water tank and empty black water when we arrived. Now we have a nearly full black tank and a nearly empty fresh tank. When the pump is on, it's running water(very quietly unlike when you turn on a faucet/flush the toilet) like it's filling up the hot water heater but we shut that off and figured it was just building pressure to the lines but then no water at all was coming out of the faucets. All faucets were off while we were driving as well. We're taking it into the dealer when we get back to see what's going on and to fix the rear stabilizers too.
Your valves are the the incorrect position for fresh water tank as your source, and you also filled the black tank with fresh water using the flush connection.
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Old 08-20-2016, 10:04 AM   #10
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Post a picture of your valves

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