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Home >> Alfa Romeo >> 2021 >> Stelvio Ti >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (2.9L - Emissions Control) >> Evaporative Emissions >> Canister, Vapor >> Description And Operation

Description And Operation

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GC0196963Courtesy of CHRYSLER GROUP, LLC

The active charcoal filter (1) is located behind the left rear wheel well.

GC0197340Courtesy of CHRYSLER GROUP, LLC
GC0196080Courtesy of CHRYSLER GROUP, LLC

When the solenoid valve canisters are closed, the fuel vapors enter the filter box inlet (1) and move downwards towards the box until they reach the active charcoal filter (4) where they are deposited. When the canisters open, controlled by the Powertrain Control Module (PCM), the outside air enters the filter through the side slits (3). Under engine intake vacuum, the air pulls the vapors to rise up in the opposite direction to the filter box until they exit via the outlet (2) and are recirculated in the engine intake.