this is what's happening- your float switch is too high, so when your pump is working and the float switch goes down to shut off the pump there is still water in the bilge. When you step onto the boat, the boat rolls and with bilgewater sloshes around, thus lifting the switch and the pump turns on...
look and see how your float switch is mounted and see if you cant move it to a lower spot in your bilge.
that will be 50 bucks please.
