So now that I have been regularly boating I have been noticing that my bilge comes on quite a bit. Even if nobody is riding and we are just hanging out. When I notice that it turns on is after I do a run. We will be floating then go back up river and when I stop the bilge kicks on and pumps all this water out???

I thought it might be because of the plug I am using and water is leaking in. but I checked in the the engine compartment and it didn't look like water is leaking in. I have to use a rubber expansion plug because my wakeplate doesn't allow me to use a brass threaded plug. There are some pics below.







Does anybody have any ideas why this might be happening?? Thanks for any info.