Yes you do (below the pump really/attached to the pump). Problem with the one in the tank is that I don't think you can order/replace JUST the "sock". Maybe someone else will chime in and say otherwise.
It's hard to diagnose over the interwebz but anytime I replaced the "sock/filter" in the back is when I replaced the entire FP in the tank. So take that for what it's worth.
Tell me, when you replaced the motor, did you just move the old plugs over?
2002 WRX Sold
2007 WRX Sold
2007 STi totaled
2007 Foz XT sold