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The vent valve solenoid is part of the evaporative emissions control system which absorbs fuel vapor from the fuel tank before it can be released into the environment.The vent valve opens to purge the vapors into the fuel system where they are burned in the combustion chambers.The system self-diagnoses when the engine is started, and any faults are reported to the vehicle's main computer. Replacing the vent valve solenoid in a 2000 Silverado is simple and straightforward.ow to Replace the Vent Valve Solenoid on a 2000 Silverado. The vent valve solenoid is part of the evaporative emissions control... 1  How to Verify if a Chevy Tahoe Solenoid Vent Is Clogged.
The EVAP canister stores the fuel vapors until the engine is able to use them. At an appropriate time, the PCM will command the EVAP purge valve open, allowing engine vacuum to be applied to the EVAP canister. With the EVAP vent valve open, fresh air will be drawn through the valve and vent line to the EVAP canister.uel tank vapors are allowed to move from the fuel tank, due to pressure in th} DUPipeline_QISnippet_FirstGood_Snippet_v1: {},{-1|-1|1|P0496 Chevrolet P0496 Chevrolet-Evaporative Emission System Flow During Non-Purge. Repair Importance Level: 1/3.