I have noticed lately that my bilge pump is acting up, now this is a 500 gph pump only six months old mounted to the deck below the transom, power to it at all times with float, as water gets above float it will kick on but will not pump water out. Was noticing this in the driveway while washing the boat out and thought maybe there was some obstruction in the hose leading to the thru hole in side of the boat so I gave her a mighty suck with my mouth (don't even go there) at the thru hole and she then started pumping, but there was no clog that came out. So then I noticed it out on the water do the same thing, pump running, no water pumping out, sucked on thru hole on outside of the boat and she started pumping, again no obstruction came out of hose, so basically it is losing prime somehow and when I suck on it then she starts pumping, any ideas ??????