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Old 03-11-2018, 01:39 PM   #1
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Fresh water tank filling through city water

I have a 2018 Sunseeker 3050s. Trying to figure out where check valve is located for fresh water tank. Have city water hooked up to RV and itís for some reason after being hooked up for 2 months now and when we went outside this morning water was coming out of fresh water fill. So shut off city water. Using water from tank but seems like pump is surging on and off. Wondering if Check valve is built in to water pump?
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Old 03-11-2018, 02:15 PM   #2
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Your fresh water pump does have a check valve in it. you need to use it ever so often for the check valve to work correctly. Also check your water pressure regulator. I had a regulator go bad on me and that also allowed my fresh water tank to fill from the city water. I have actually started carrying a spare regulator valve with me so that I can change it out to check to see if that is the problem. Try to use your fresh water pump for a day or two and then switch to city water. If your fresh water tank continues to fill then try replacing your water pressure regulator. If that does not stop the fresh water tank from filling then you may need to replace the fresh water pump. Hope that this helps.
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Old 03-11-2018, 02:19 PM   #3
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Read this thread and see how much of it is helpful ==> Water Tank Fills When On City Water.
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Old 03-11-2018, 02:20 PM   #4
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Thanks. Iíll pick up another water pressure valve tomorrow. I have been using the pump on and off for the past few months. Pump sounds like it is surging on and off. Didnít use to sound like that. Thanks again
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Old 03-11-2018, 07:47 PM   #5
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Read this thread and see how much of it is helpful ==> Water Tank Fills When On City Water.


Thanks Mr Dan! going to try the different things from this thread. Running on pump now. City water is shut off. Thanks everyone for all the help. Iíll post and let you know how I make out tomorrow.
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Old 03-11-2018, 08:10 PM   #6
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Thanks Mr Dan! going to try the different things from this thread. Running on pump now. City water is shut off. Thanks everyone for all the help. Iíll post and let you know how I make out tomorrow.


Ditto to the recommendations posted so far. I had the same problem last month when I didnít use my regulator. I also picked of a check valve and installed it before the pump.

If you need s new pump, I picked my same model up on Amazon for $69. Was $149 at camping world.
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Old 03-11-2018, 08:21 PM   #7
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Ditto to the recommendations posted so far. I had the same problem last month when I didnít use my regulator. I also picked of a check valve and installed it before the pump.

If you need s new pump, I picked my same model up on Amazon for $69. Was $149 at camping world.


Thanks! If I need a new pump I hope it should be covered under warranty. Didnít have unit a year yet. Where did you pick up the check valve you added to your line?
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Old 03-11-2018, 08:27 PM   #8
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Thanks! If I need a new pump I hope it should be covered under warranty. Didnít have unit a year yet. Where did you pick up the check valve you added to your line?


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Old 03-11-2018, 08:40 PM   #9
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Quote:
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I have a 2018 Sunseeker 3050s.
....
Wondering if Check valve is built in to water pump?
A ShurFlo pump has a check valve built into the pump head. Itís the little round object in the center of this pic. If it gets stuck open a little by grit, etc., you have your problem of blow-by to the fresh water tank. In my case, the valve appeared to be microns too small and would stick in the hole in which case the pump wouldnít ďdraw waterĒ.
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Old 03-12-2018, 02:44 PM   #10
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Originally Posted by Wiggler View Post
I have a 2018 Sunseeker 3050s. Trying to figure out where check valve is located for fresh water tank. Have city water hooked up to RV and itís for some reason after being hooked up for 2 months now and when we went outside this morning water was coming out of fresh water fill. So shut off city water. Using water from tank but seems like pump is surging on and off. Wondering if Check valve is built in to water pump?
I am having the same problem in my 2017 SS 3050S.

I have changed out the pump and still have the problem.

I noticed that it won't backfill if we are using water on a regular basis, however, we left for a day and the FW tank was overflowing when we got back.

I noticed that if you haven't used water for a time, when you turn it on there is higher pressure for an instant, which leads me to believe that, even with a good pressure reducer, the FR SS water system incurs increasing pressure over time if water is not constantly being used.

This increase of pressure could over-ride the check valve in the WP.

As far as the surging is concerned, mine surges if the faucet is not full open.

Check your WP manual as I believe there is an adjustment on the WP to reduce the surging.

If your WP is in the compartment just behind the rear tires on the passenger side, next to the water filter, then it is a chore to change out the WP, (must remove the plastic panels in that compartment).

I am still trying to locate the best place to put a 'SharkBite' check valve to prevent this problem but waiting for warmer weather before I pull everything apart again.

Let me know if you come across another solution.
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