Subaru 2002 Impreza Service Manual page 101

EVAPORATIVE EMISSION CONTROL SYSTEM
Emission Control
(Aux.
Emission Control Devices)
F: PRESSURE CONTROL SOLENOID VALVE
The fuel tank pressure control solenoid valve is located in the evaporation line between the shut-off
valve on fuel filler pipe and the fuel tank. It adjusts the fuel tank inside pressure under the control
of the ECM.
When the tank inside pressure becomes higher than the atmospheric pressure, the valve is
opened allowing fuel vapors to be introduced into the canister.
On the other hand, when the tank inside pressure becomes lower than the atmospheric pressure,
external air is taken from the drain valve into the canister.
The pressure control solenoid valve can also be electrically closed for the system diagnosis pur-
poses.
B2H1719C
(1) Filter
(2) Coil
(3) Connector terminal
(4) Diaphragm
(5) Valve
A: Atmospheric pressure
B: From shut-off valve
C: To fuel tank
EC-15