Fresh tank filling from city water

[k31bassman]

I have a 2016 DSBH. My fresh water tank has been filling when I'm hooked up to city water. It seems to take 6-12 hours for that to happen. I'm guessing the check valve in the water pump is bad or has debris stuck in it to allow the city water past, filling up the fresh water tank. Has anyone else had this happen? What did you do to fix this? Thanks!

[Sundancer330]

The easiest way to correct is install an inline check valve on the water supply line. Otherwise you will have to pull the pump and replace the check valve, or try to flush out the pump real good using water from the tank.

[travelingjw]

I am with Sundancer, quick fix, easy solution. if that doesn't work, and before you replace the pump, the only other solution I have used in the past is to drain the lines, hook up an air-compressor starting with very low pressure. Slowly increase the pressure to no more than 30 PSI to see if it will dislodge the stoppage. If that doesn't work, then pull out the pump. Do not under any circumstance increase above 30 PSI because while most tubing/connections is rated higher with "water pressure," running air in water lines can dislodge o-rings that might be stretched a bit. We used to do this in the semi-conductor industry and it worked 30 - 40 % of the time. Again, do not go above 30 PSI or you may blow out multiple o-rings or gaskets.