GM 17075840 Canister Assembly, Fuel Vapor

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The system takes fuel vapors in form of gases that are produced by evaporations of fuel in the fuel tank, throttle body and intake-manifold and stores it in canister made of charcoal together with the hoses that connects the canister to the above mentioned parts. The evaporative emissions are stored in the storage canister when the vehicle is motionless or non-operating while during vehicle operation, the intake air flow draws the vapours from the canister to burn in the engine. Problem like poor idle, stalling, and driveability may come from a faulty purge valve or a bad canister or damaged hoses. Fuel spills or smells are often a sign of liquid fuel leakage from several parts, a faulty canister or issues to do with the hoses and air cleaner seating. All hoses must be checked for twists and rupture, the canister must be for crackages or damages, leaks in the parts require replacement. The bottom of the canister should also be checked to see whether the filter is dirty or damaged and if it is, should be replaced by another one. A short hose can be connected to the PCV tube of the purge valve assembly to check airflow while the check valve can be tested with a hand vacuum pump; if vacuum is not held by the diaphragm, the canister should be replaced. Therefore, if the vacuum is held by the diaphragm, then the rate of airflow in the PCV tube should enhance in case it does not, then recommend for a replacement of the canister.

To remove the canister, hoses are disconnected, retainer screws are removed, and the canister is lifted out. If equipped with A/C, any necessary attachments should be loosened. The canister is then tagged and disconnected.

It is important to periodically check the canister connecting lines for kinks or other damage and deterioration.

The EVAP functions to prevent fuel vapors from escaping the fuel system into the atmosphere by trapping them inside the fuel tank until the pressure overcomes the pressure relief valve, routing them to a carbon canister for temporary storage.