Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Legacy 2000-2003 Approved Subaru Legacy 2000 2000 Service Manual MECHANISM AND FUNCTION SECTION Emission Control System and Vacuum Fitting MSA5TCD00L18136

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              LEGACY (W2260BE_SGML Complete)

                                        MECHANISM AND FUNCTION                               [M8B0]   2-1
                                                       8. On-board Refueling Vapor Recovery (ORVR) System

8. On-board Refueling Vapor Recovery (ORVR) System
The on-board refueling vapor recovery system allows the fuel evaporation gas in the fuel tank to
be introduced directly into the canister through the vent valve when the fuel tank inside pressure
increases as a result of refueling.
The diagnosis of the system is performed by monitoring the fuel tank inside pressure detected by
the fuel tank pressure sensor while forcibly closing the drain valve.

D While driving
Since the back side of the diaphragm in the pressure control solenoid valve is open to the atmo-
sphere, the diaphragm is held pressed by the atmospheric pressure in the position where only the
external air is introduced into the canister. When the evaporation gas pressure acting on the other
side of the diaphragm increases and overcomes the atmospheric pressure, it pushes the dia-
phragm and opens a port through which the evaporation gas makes its way to the canister.


     (1) Canister                                         (4) Intake manifold
     (2) Pressure control solenoid valve                  (5) Shut valve: opened
     (3) Purge control solenoid valve

                          LEGACY (W2260BE_SGML Complete)

2-1     [M8B0]                   MECHANISM AND             FUNCTION
8. On-board Refueling Vapor Recovery (ORVR) System

D While refueling
As fuel is filled in to fuel tank, internal pressure is increased. When internal pressure overcomes
atmospheric pressure, port of the vent valve is opened, and evaporation gas is introduced into
the canister through the vent line. Fuel vapor is absorbed by a chacoal in the canister and purified
air is discharged from the drain valve. When a filler gun is inserted, the shut valve closes the evapo-
ration line.


      (1) Canister                                         (4) Shut valve: closed
      (2) Pressure control solenoid valve                  (5) Filler gun
      (3) Vent valve


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