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Old 03-14-2019, 11:34 PM   #1
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Brand: Thor Motor Coach
Model: Hurricane
State: Florida
Posts: 12
THOR #9981
Fresh water tank overflowing

I have a 2017 Hurricane 34J which has a problem with the fresh tank overflowing when hooked up to city water. A service tech told me that it was the backflow preventer in the pump that was bad and to replace it. I did this and it seemed to work at home when hooked up. I do have a pressure regulator set at 45 psi. When we went camping last week immediately the tank overflowed. I added an external check valve after the pump but the pump will not shut off.
Anyone else have this problem or how to resolve this?
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Old 03-15-2019, 12:13 AM   #2
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Brand: Thor Motor Coach
State: Texas
Posts: 113
THOR #8139
Wow a good one. The tech was thinking you have the usual " Fresh water tank is overflowing."

The quick way to stop the pump is to pull the 12v fuse.

Now for trouble clearing.
1. Unplug from 110ac
2. Flip use/store to store
.....did the pump stop (you did put the 12v fuse back in, didn't you)
3. Turn the city water OFF
4. Check (operate 2 or 3 times) the fresh water pump switch, make sure it's off
5. Flip the use/store switch to ON
....did the pump start
6. If it did take the fresh water switch out of the panel (take a picture of the wires) and pull the wires off
....did the pump stop, if it did you have a bad switch maybe

More help is on the way, let us know.
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Old 03-15-2019, 12:44 AM   #3
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Brand: Thor Motor Coach
Model: Hurricane
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THOR #9981
The pump switch works I can switch it off and on.
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Old 03-15-2019, 03:08 AM   #4
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Brand: Thor Motor Coach
State: Texas
Posts: 113
THOR #8139
Here are some threads about the fresh water tank filling when hooked to city water.

water pump

Hooked to outside water - fresh water tank overflows

backflow water at campground. low PSI?

Lots of threads if you use the advanced search.

We've never had this problem with any rv, but we always turn the pump off before turning the city water on.

Try this
Turn the city off.
Turn the pump off on off on OFF
then open a faucet to releave pressure then close the faucet.

Make sure the pump is off then turn the city water on.

Check the water level for the water tank, often.
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Old 03-15-2019, 03:38 AM   #5
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Brand: Thor Motor Coach
Model: Hurricane 31S
State: Texas
Posts: 947
THOR #6411
Quote:
Originally Posted by Tampa.bankie View Post
I have a 2017 Hurricane 34J which has a problem with the fresh tank overflowing when hooked up to city water. A service tech told me that it was the backflow preventer in the pump that was bad and to replace it. I did this and it seemed to work at home when hooked up. I do have a pressure regulator set at 45 psi. When we went camping last week immediately the tank overflowed. I added an external check valve after the pump but the pump will not shut off.
Anyone else have this problem or how to resolve this?
The external check valve goes between the tank and the pump; not after the pump or the pump will run continually. The pump has two adjustments one for pressure relief and another for max pressure. These adjustments are separate from the anti-back flow valve. You don't have to replace the entire pump if the motor is still turning, only the pressure head.
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Old 03-15-2019, 11:27 AM   #6
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Brand: Thor Motor Coach
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THOR #9981
Beau 388
Was thinking that the check should be before the pump. Will try that.
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Old 03-15-2019, 02:44 PM   #7
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Brand: Thor Motor Coach
Model: Hurricane 31S
State: Texas
Posts: 947
THOR #6411
Quote:
Originally Posted by Tampa.bankie View Post
Beau 388
Was thinking that the check should be before the pump. Will try that.
You want to stop water from leaking back into the tank but you want the pump to see the water pressure in the lines so it knows when the set pressure is achieved. This setup works just like a foot valve on a shallow well pump..
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Old 03-16-2019, 12:04 PM   #8
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Brand: Thor Motor Coach
Model: Challenger 37 LX
State: Florida
Posts: 249
THOR #7853
Install a shutoff valve in the line between the tank and pump. Close valve when using city water, open valve to use pump. Works fine and no more worries about the check valve.
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Old 03-16-2019, 12:26 PM   #9
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Brand: Thor Motor Coach
Model: Chateau 35SF
State: Missouri
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THOR #2020
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Originally Posted by RV Pirate View Post
Install a shutoff valve in the line between the tank and pump. Close valve when using city water, open valve to use pump. Works fine and no more worries about the check valve.


All of my units have had a valve between pump and tank. Have to close it to suck antifreeze into pump. I had intermittent problems with previous MH so put the removable panel on a hinge to make it easy to get to valve. Never had the problem again.
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Old 03-17-2019, 06:15 PM   #10
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Brand: Thor Motor Coach
Model: Hurricane
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THOR #9981
I have a valve at the tank but itís not that easy to get to as itís under the bed. I tried putting the check valve in before the pump an that did not work either. So I am back to the original setup and at present hooked up to the water at my house so far it seems to work as it should. My regulator is set at 50 psi thinking I may try dropping that down and see if that causes the problem to return.
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Old 03-18-2019, 02:32 AM   #11
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Brand: DRV
Model: 38 RSB3
State: South Dakota
Posts: 1,328
THOR #1658
There are many different type of water connection/dispersement systems out there. I had the same issue. The water selector stem needed to be replaced. 5 minute job. I have a Kantleak system.
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