WARNING: This page is about a different car, the 2012 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Fuel Tank Pressure Chart (Normal)
Courtesy of SUBARU OF AMERICA, INC.
evptez - evptezha ≤ 0.4 kPa (3 mmHg, 0.1 inHg) Normal when above is established