not sure on the 3300 but on our 2800 it's located on the starboard side and mounted near the transom area. You should be able to folloow the larger rubber lines (approx. 1 1/2") out of the tank and going into and out of the pump.
BB
I don't have one at this time. My 2003 31ft was located on a platform above the tank. I just want to know where I would have been located. I see an outlet on the tank but no connections.
I thought it may have been on top of the holding tank. My 31ft was. I had a 1999 30ft and it was way back underneath the swim platform, I think. Never looked for it.