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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 CVCV is located on the EVAP canister (underneath the vehicle near the left rear tire) and is used to seal the canister vent. It has one hose connection and one two-wire electrical connector. The solenoid in the EVAP CVCV responds to signals from the ECM.he canister contains charcoal granules which adsorb gasoline vapor and store them temporarily until the engine intake manifold vacuum draws them off. A malfunction of the EVAP system is unlikely to cause the high fuel consumption you report. However, it may be a useful clue pointing to a fuel leak.