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on modern cars the fuel system is unvented. The evap purge and vent solenoid goes to a charcoal canister. When the vehicle is off the fuel tank is connected to the charcoal canister through the P/V solenoid and it absorbs the vented gas fumes from the tank. When the vehicle is on and at speed the solenoid switches and the charcoal canister is connected to engine vacuum and the vacuum of the engine purges the gas fumes in the charcoal through the engine burning them

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16y ago

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