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Old 12-04-2020, 12:01 AM   #1
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Fresh water tank

WHY does my fresh water tank occasionally fill to overflowing when Iím hooked up to city water???

I recently had the check valve in the water pump replaced hoping that would fix the issue but I discovered that itís occurred again tonight....

Doesnít do it all the time - just occasionally....
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Old 12-04-2020, 02:10 AM   #2
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Well, that one single check valve in the pump is the only isolation between city water pressure and the fresh water tank. Might want to think about adding a second check valve external to the pump.
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Old 12-04-2020, 02:17 AM   #3
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Good idea ...... before or after the water pump???? Just cut the pvc and install???
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Old 12-05-2020, 05:27 PM   #4
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Think Iím just gonna replace the entire pump... tired of dealing with check valve issues, especially after having a new one installed back in June...,

Anyone ever used a Highflow brand pump??? 4.5 gpm at 60psi... Tractor Supply has it for $119.00.... I believe itís main use is as a sprayer pump...
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Old 12-07-2020, 09:29 AM   #5
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Is that pump you're replacing a Shurflo 5900-0201?
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Old 12-07-2020, 09:51 AM   #6
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Iím going through the same thing right now. Iím staring at all the new parts as we speak. On another post I was informed that the water miser if you have one may also be causing the problem and not the pump. I havenít investigated that yet. My fresh water tank 52 gallons would fill to overflowing in less than 24 hours.

Instead of check valves Iím using a shut of valve and will only turn it on when not connected to city water. Good luck with your issue.
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Old 12-07-2020, 10:47 AM   #7
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Iím putting in a new water pump!!!

My understanding is that the check valve in the water pump should not allow this to happen...

Itís really frustrating to go outside and see water coming out the overflow tube every day or so...

Iíve already had the check valve replaced to the tune of $172 so a brand new, larger (5.5 gpm vs 3.5 gpm) for $120 is a no brainer to me....

Should receive new one Thursday.... And itís not another Shurflow!!!
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Old 12-07-2020, 07:18 PM   #8
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The pump Iím replacing is a Shurflo 4008-101-E65 that produces 3.5 GPM... Had it installed June 2019 and had a new check valve installed June 2020...


Iím replacing it with a SEAFLO 55 Series 5.5 GPM Variable-Flow Automatic-Demand Water Pump.... cost - $120.00
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Old 12-08-2020, 05:31 PM   #9
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Surge tank

Anyone ever have a surge tank so the pump doesn't run continuously ?
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Old 12-08-2020, 05:36 PM   #10
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Mine only runs when a faucet is turned on.... shuts off when faucet is turned off...

Iíd think one running constantly might indicate a leak maybe???
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Old 12-10-2020, 05:25 PM   #11
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New pump all installed....

Seaflow 51 series - 5.5 GPM.... SUPER QUIET!!!! $109.00

Easy install....

Drained water out of my fresh water tank so I can tell if pump allows water to fill it....

Fingers crossed!!!!!
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Old 12-10-2020, 09:41 PM   #12
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Oh - I didnít drain ALL of the water out of my fresh water tank.... Just enough to show a gap at the top of the tank...

That way I can tell if the check valve is doing itís job....
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Old 12-11-2020, 08:30 AM   #13
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If you still fill the tank after all this work take the water selector out to see if the o-rings are torn. That was my problem, replaced it no more problems.
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Old 12-11-2020, 08:59 AM   #14
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Do you have a water pressure regulator on the hose coming from the city water? Reduce the pressure from the city water.
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Old 12-11-2020, 09:04 AM   #15
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Quote:
Originally Posted by ernest917 View Post
Iím putting in a new water pump!!!

My understanding is that the check valve in the water pump should not allow this to happen...

Itís really frustrating to go outside and see water coming out the overflow tube every day or so...

Iíve already had the check valve replaced to the tune of $172 so a brand new, larger (5.5 gpm vs 3.5 gpm) for $120 is a no brainer to me....

Should receive new one Thursday.... And itís not another Shurflow!!!

If your city water pressure is high (large campground), the city water pressure can over come the Fresh Water tank pump check valve. Reduce the city water pressure with a pressure regulator on the hose. It sounds by some of your statements that you my have your Fresh water tank pump 'on', when hooked up to 'city water', the fresh water tank pump should be 'off'.
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Old 12-11-2020, 12:35 PM   #16
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Iíve always used a regulator..... I carry 4-5 on board....
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Old 12-11-2020, 12:35 PM   #17
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Pumps always off when hooked to city water....
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Old 12-11-2020, 12:54 PM   #18
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It appears the new pump has resolved my issue - fresh water tank not filling now.... been almost 20 hrs with city water turned on....

Fingers crossed!!!
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