I had that exact problem on my 1950 Tahoe. The problem was that the flipper switch attached to the pump had a piece of fiberglass that cause the switch to be constantly on. Once I cleared that it works fine. The pump on mine boat was about 6-8" from the rear drain plug.2016 Tahoe 2150 bilge pump runs constantly even with power off. No water is pumping out. I think debree is stuck and also possibly flit is stuck. How do I access the pump. Can’t seem to find where it is located.