Larry,
You should have a tiny filter just in front of the water pump. My travel trailer did not come with one and it caused to pump to fail. I installed a pre-filter with the replacement. The installation instructions on the new Shurflow pump recommends a pre-filter. BTW I disassembled the failed filter and found it clogged with polyethylene debris from the installation of the tank fittings. Shoddy manufacturing. Also, Gulfstream, soon after delivery I had to reach up my black water outlet to remove the circular chunk of the floor from the toilet installation. It had plugged the drain pipe.
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