Subaru Impreza 2003 Service Manual page 946

FUEL INJECTION (FUEL SYSTEMS)
32.Fuel Damper Valve
A: REMOVAL
1) Release the fuel
FU(H4DOTC)-53, RELEASING OF FUEL PRES-
SURE, OPERATION, Fuel.>
2) Remove the fuel damper valve from fuel return
line.
FUEL DAMPER VALVE
pressure. <Ref. to
FU-00121
FU(H4DOTC)-68
B: INSTALLATION
Install in the reverse order of removal.