The Nissan Maxima's Vapor Canister captures fuel vapors from the tank and holds them in activated charcoal until the engine is operating. When these vapors are drawn into the intake to be burned, it reduces atmospheric hydrocarbons. The Vapor Canister, usually placed in the engine compartment or close to the tank, is connected to both the tank and a purge valve. It contains charcoal that adsorbs and stores fuel vapors from the tank. When the engine is warm and running, manifold vacuum pulls fresh air through the charcoal, lifting the stored vapors which are then directed to the combustion process. The Maxima platform employs the Vapor Canister as the main storage chamber within the Nissan evaporative emission architecture, which uses a pressure-vacuum relief fuel cap to keep vapor sealed. Due to the extensive surface area of the microporous charcoal, it adsorbs a significant vapor volume. Certain versions of the Vapor Canister possess a replaceable filter that is changed if saturated. Nissan models now have on-board diagnostics that test the Vapor Canister, purge valve, vent solenoid, and tank pressure sensor for leaks so that the Maxima will meet emission standards. With them, Nissan fuel vapor loss stays minimal and will not impact Maxima efficiency.
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