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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.
EVAP Monitor. The Evaporated Emissions system is designed to prevent the vehicle fuel system from emitting unburned hydrocarbons to atmosphere. It does this by the simple expedient of subjecting the petrol tank to vacuum through a carbon vapour store, which collects the evaporated fuel and stores it.he EVAP system has its own Electronic Vacuum Control valve, similar to that used on the EGR system, built into the Canister Purge Valve CANP,) mounted down on the offside engine bay. This connects a pipe to the EVAP Canister, a plastic container mounted near the petrol tank.