The Vapor Canister in a Nissan Sentra stores excess fuel vapors so they can be burned rather than emitted into the air. The Vapor Canister is located in the engine bay or near the fuel tank. It contains activated charcoal with microscopic pores that capture hydrocarbon vapor until a vacuum draws it back through a purge valve. While the Nissan engine is running, air from the atmosphere enters the canister through the opening of the purge valve, allowing air to mix with the trapped vapor and flow through to the combustion chambers for normal burning. Hydrocarbon emissions drop, and Sentra fuel economy and drivability can remain stable during this process. On certain occasions, the Vapor Canister develops cracks or an internal leak, or the filter might get too clogged. This typically results in the car running rough, a fuel odor being present, or mileage dropping off. Some versions come equipped with a replaceable filter that needs to be changed periodically so that vapor can flow freely through the Nissan Sentra EVAP lines. Current onboard diagnostic systems are capable of sealing the system and monitoring a tank pressure sensor to verify that the Vapor Canister and hoses are holding a vacuum. If the change is not present, it triggers a warning light. A Vapor Canister is designed to last the life of the vehicle. Should yours be defective, however, it must be replaced for the evaporative emission control system of your Nissan Sentra to work properly again.
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