Lookin for some advice

[TYLER MM]

Hey everybody, I'm brand new to kayak fishin and just recently bought a Stealth 12 during the OEX sale up in LA. The only thing I've had done is hookin up the livewell which was installed at OEX in Mission Bay. Only 2 trips under my belt. Once in Mission Bay and once in SD Bay. Mission bay was a good trip with no trouble but SD Bay was a real wake up call to the risk out there. While out there I grabbed a scoop of bait and after an hour or so of fishin the kayak starts feelin different a little heavy I guess. And without understanding how I realize I'm takin on some serious water now cuz I'm sinkin. Not extremely fast but I'm goin down. I manage to get to shore, open up the hatch and the hull is about 1/2 full of water. After reading a few of the other posts, it sounds like it's the bait pump pumpin to much water in to fast. Is a timing switch the right fix for this? And is that the only thing I would need for this. Oh and a bilge pump. Thanks guys