It really sounds as if air is getting sucked into the suction side somewhere. One place to look is the screen filter - probably attached to the pump on the suction side. Look for a loose filter bowl, or a missing bowl gasket. Also as previously suggested look to see if the winterizing hose valve is slightly open.
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There's lots of advice and information in forums... sometimes it is correct. For example, all of my posts are made by a political appointee who got the job as a reward for contributions to my diesel bill.
2011 Jayco 28.5RLS; 2021 Chevy Duramax; Pullrite Superglide Hitch
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