Subaru Impreza 2003 Service Manual page 2706

OIL PUMP
POWER ASSISTED SYSTEM (POWER STEERING)
7) Tighten the bolt of belt tension.
Tightening torque:
25 N·m (2.5 kgf-m, 18.1 ft-lb)
8) Install the pulley belt cover.
9) Connect the battery ground cable to battery.
10) Feed the specified power steering fluid. <Ref.
to PS-88, Power Steering Fluid.>
CAUTION:
Never start the engine before feeding the fluid;
otherwise vane pump might be seized up.
PS-82