I had this problem as I didn't have a psi thingy for the hose and had high psi from one place, it was so high, it, blew a hole in the hose. So I did something to the check valve. Took it apart and cleaned and put together, still had back filling, so I gave it a permanent fix, ( as I was leaving that place shortly) went to hardware store, got shut off valve, cut hose that goes to and out of fresh tank, shut valve off, no way to backfill anymore. when needing to use the tank, I just turn valve on. I have since taken it apart and lubed everything and I think its fixed without replacing anything. Just take it apart, pay attention where and how it comes apart, and reinstall, and iffffff, still back fills, then replace or do the cheep and dirty permanent fix I did. Best of luck.
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