I have purchased a 1990 vanguard boat,it has a home made livewell,in the well it self it has a pump on the bottom (minn king 360) and the outside of the well there is a aerator pump(attwood a 500) mounted on the hull,How does the livewell work does the outside pump ,pump the water in and the pump in the livewell pumps water out,should both be running at the same time,I can't seem to get either pump to come on .