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Old 12-27-2018, 11:49 PM   #1
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Brand: Thor Motor Coach
Model: Four Winds 31E (2019)
State: California
Posts: 180
THOR #12270
backflow water at campground. low PSI?

im currently setup at a campground in Blythe, CA and i think the check valve at the tank is not closing all the way. if i turn on the faucet, it will very slowly leak past the check valve and fill up the fresh water tank until it's overflowing out the fill-up port. i could understand if this was a kantaleak valve system but it's not.

i connected my pressure gauge to it and it said ~50 psi. thing is, the water works in my driveway and does not fill up the fresh tank. pressure at my house is ~75-80psi. i do have a regulator thats set to 53PSI. so 53 is the max pressure i allow incoming to the RV.

does that 3psi relay matter that much? i think it's enough to not close the check valve all the way and so it's leaking. what do you guys think?
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Old 12-28-2018, 12:10 AM   #2
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THOR #7035
No, bur dirt/debris in your water pump can cause backflow to the tank. Turn off city water and run your pump for a few minutes and then see if it still leaks/backflows.
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Old 12-28-2018, 12:20 AM   #3
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THOR #12270
i have. ive been here 4 days (with 3 days remaining.) and have cycled between tank and city water. in that time ive done 2 cycles (tank down to ~50% and refiled with city leak) and it still has back-flow into the tank.

i checked the filters and see no visible dirt/debris. thats why i thought it was a PSI problem.
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Old 12-28-2018, 12:26 AM   #4
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Model: Axis 24.1
State: Michigan
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THOR #1150
If running the pump doesn't fix it; it is possible there is a problem with your water pump (which is where the check valve is).
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Old 12-28-2018, 01:05 AM   #5
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THOR #8860
Yup! The most likely suspects are either crud caught in the check valve, or the valve itself.
The difference in the water pressure isn't the issue.
Good luck!
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Old 12-28-2018, 02:21 AM   #6
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Model: Hurricane 29M
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THOR #11781
My 29M did that on one trip. Cleaned the 'crud' bowl and it hasn't happened again.
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