Subaru April BRZ Service Manual page 118

PERIODIC MAINTENANCE SERVICES
36) Install new O-rings (A) and (B), and new back-up ring (C) to the pressure regulator.
37) Install the pressure regulator to the fuel filter assembly.
CAUTION:
Make sure that the O-ring is not cut or pinched when installing.
NOTE:
Apply gasoline to the pressure regulator.
Fuel Filter
PM-46
(A)
(B)
(C)
PM-00610
PM-00609