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Old 05-17-2015, 02:07 PM   #11
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Ours use to work like it is suppose to, but now city water does end up in the water tank. I just wait until the water tank is about full, turn off the city water, and urn on the pump until the tank is drained down. It is a bother, but not too much.
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Old 05-17-2015, 02:18 PM   #12
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A check valve downstream of the pump will solve it and save the pump
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Old 05-17-2015, 02:25 PM   #13
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Ours use to work like it is suppose to, but now city water does end up in the water tank. I just wait until the water tank is about full, turn off the city water, and urn on the pump until the tank is drained down. It is a bother, but not too much.
You can get a kit and rebuild the pump or just replace the pump and eliminate the problem.
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Old 05-17-2015, 02:26 PM   #14
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I have the same problem with our Sierra FW. The valve where you select either city water or fill holding tank will not always close completely. This happens because they put a plastic handle on a brass valve body. The plastic cracks so now it fits loose on the valve stem. When you turn the handle either direction it hits the stop before the valve stem is completely closed. To verify if this is the case turn the valve all the way one direction then remove the handle. The square stem should be parallel with or perpendicular to the valve body.
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Old 05-17-2015, 05:45 PM   #15
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I have the same problem with our Sierra FW. The valve where you select either city water or fill holding tank will not always close completely. This happens because they put a plastic handle on a brass valve body. The plastic cracks so now it fits loose on the valve stem. When you turn the handle either direction it hits the stop before the valve stem is completely closed. To verify if this is the case turn the valve all the way one direction then remove the handle. The square stem should be parallel with or perpendicular to the valve body.
On the Legacy the city fill and fresh fill are at 2 separate locations so I don't think this is our problem.

I appreciate all the responses. We will get it back to the dealer and have them replace the pump. It's a brand new DP!
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Old 05-17-2015, 06:31 PM   #16
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I had the same problem, evidently had some trash in the water pump check valve. When they cut the holes in the tanks, sometimes some plastic shavings drop down in the tank, on the gray and black tanks this isn't a problem, but on the fresh water tank it can cause problems. Sometimes you can clear it by running the water pump. I added another, plastic check valve, on the outlet side of the water pump. Solved the problem, a lot cheaper than rebuilding the water pump or buying a new one.


Good luck


Good luck
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Old 05-17-2015, 08:21 PM   #17
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On the Legacy the city fill and fresh fill are at 2 separate locations so I don't think this is our problem.

I appreciate all the responses. We will get it back to the dealer and have them replace the pump. It's a brand new DP!
Love to hear what they say, however, like many of these posts, sometimes those little check valves will fix themselves. There is frequently a little backwards leakage, won't cause any issue at a festival. That's what we do frequently.

The tank drain is really in a strange place for a flat tank. We will have a hard time ever using the last 8 or 9 gallons of water in the tank if need be. I drained mine and used the jacks to raise the left side of the coach just a bit to get all the water out.
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Old 05-17-2015, 08:31 PM   #18
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tighten water fill cap

mine did that first time out. i tightened the water cap and it stopped.
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