Subaru April BRZ Service Manual page 120

PERIODIC MAINTENANCE SERVICES
40) Install a new O-ring to the fuel filter assembly.
CAUTION:
Make sure that the O-ring is not cut or pinched when installing.
NOTE:
Apply gasoline to the O-ring.
41) Install the jet pump to the fuel sub tank.
42) Engage the three tabs, and install the fuel filter to the fuel sub tank.
Fuel Filter
PM-48
PM-00612
PM-00603