On-Board Refueling Vapor Recovery (Orvr) System - Subaru 2002 Impreza Service Manual

ON-BOARD REFUELING VAPOR RECOVERY (ORVR) SYSTEM
Emission Control
(Aux.
Emission Control Devices)
0
While refueling
As the fuel enters the fuel tank, the tank inside pressure increases. When the inside pressure be-
comes higher than the atmospheric pressure, the port of the vent valve opens, allowing the fuel
vapors to be introduced into the canister through the vent line. The fuel vapors are absorbed by
charcoal in the canister, so the air discharged from the drain valve contains no fuel. When a filler
gun is inserted, the shut-off valve closes the evaporation line.
(1) Canister
(2) Pressure control solenoid valve
(3) Vent valve
NF0472
(4) Shut-off valve: closed
(5) Filler gun
EC-21