this may sound crazy but since you have a spare GM pump, you could install it with Y valves (one on the black water intake, one on the water supply side) and a switch. that woudl allow you to switch pumps at any time when that happens. also, it will empty most of the line making the job less unpleasant.
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Thread: Miami Boat Show Raft Up Party
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Re: Miami Boat Show Raft Up Party
Pascal
Miami, FL
1970 53 MY #325 Cummins 6CTAs
2014 26' gaff rigged sloop
2007 Sandbarhopper 13
12' Westphal Cat boat