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Fresh water tank issue

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10 hours ago, hermanmullins said:

Welcome to the Forum. 

Most likely your check valve is bad in your pump.


This definitely sounds like the first thing I'd be checking as well. If the pump is still functioning otherwise, you can try:

1) Opening the pump and cleaning it - could just be a piece of sand or other crud/mineral buildup in there keeping the check valve from sealing,

2) Rebuilding the pump - there are kits available. But overall cost of just replacing it is sometimes not much more so it may not make sense.

3) Installing a check valve on the outlet line of the pump to prevent water from the system from backing up past the pump and putting any stress on the check valve inside the pump. On some pump models the check valve is somewhat lightweight, making them easy to damage if the shore water pressure is too high.

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