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Old 01-19-2011, 04:01 PM   #1
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Fresh Water Pump and water line diagram

Hope this is correct place to ask this question. I am new memeber and need some help with locating fresh water pump in a 2001 National RV Diesel pusher 7390.
This is a 10 year old MH, but new to us. Have water leaking and trying to find what is leaking lines , pump or what?
Need diagram of water system, we have no manuals. Any help with owners manual or any would be appreciated.
Joe
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Old 01-19-2011, 04:20 PM   #2
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Usually if you turn the pump on, you can locate it by following the sound.

You can find a lot of them in the fresh water compartment.
Where you hook the city water hose at.
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Old 01-19-2011, 09:16 PM   #3
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In my experience National RV usually places the pump in the water bay, with the rest of the plumbing, but it can vary by model and floor plan.

Even if you had a schematic, it won't show you where the tubes actually run. To find a leak, just start looking for water where it shouldn't be.

If your "leak" symptom is simply occasional pump cycling when no faucet is open, then it is probably the check valve in the pump itself, allowing water to "leak" back into the fresh tank.
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Old 01-20-2011, 10:31 AM   #4
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Thank you for the information. We will check it out
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Old 01-24-2011, 09:40 AM   #5
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Joecon, another place to look is under the kitchen sink. usually it will be behind a removable panel, turn on the water and follow the sound. If the pump has been replaced before, sometimes the original water lines have been cut and flexible tubbing and hose clamps put the system back together. Thats where our leak was. DACOTAH
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