Check the bypass for filling the system with antifreeze.
That one should be fully closed. And the one to the tank should be fully open.
After that, check that the filter housing is on tight and not cracked or mis-installed.
Also, is there enough sanitizing solution in the tank? I've found at I need least 1/3 full for the pump to prime itself properly.
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TT 2015 19RD "TheJayco"
TV 2003 F-350 "Montblanc" - Housebroken chore truck
Sitting in The Cheap Seats.
And proud of it!
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