When we pump
the plunger gets harder to push until it won't push at all. I took it apart at the handle and if I push on the lever sea water
will come out (so seacock seems to be open) but the plunger won't pump
it. If you continue to push on plunger the fresh water
in tank will go down a little at a time until there's a big whoosh and it's back to working for a short time. There doesn't appear to be a blockage. Could it be trapped air? Anyone else have this problem? If so, what did you do to fix it? Thanks in advance!