Nissan 14950-1B000 CANISTER Assembly-EVAPORATION

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Finally, the fuel evaporation control system known as the EVAP system, takes in fuel vapor and injects them into engines where they form part of the air-feed mixture during engine operation. This is a charcoal chamber that is mounted on fuel tank, ported vacuum and intake manifold vacuum coupled with purge control valve that is installed in the canister which is filled with charcoal. Starting from the 1996 models, this valve is controlled either by a EGR/ EVAP canister control solenoid depending on the year and model; California models from 1998 have a separate EVAP control solenoid mounted on the throttle body bracket. The fuel vapors are accumulated in the said canister when the engine is not running and released during execution to help in the burning of fuel. Problems of idle and stalling or poor driveability may be caused by a faulty solenoid valve or a bad canister or defective hose. Loosing fuel or smell like fuel may be as a result of fuel line leakage, defective check valve or vapor line. The hose should be checked for formation of kinks and leakage and the canister for formation of any cracks. If fuel leaks from the canister, then it has to be changed, in addition to examining the hoses as well. The purge control valve must be tested through creation of vacuum to check if it can hold the vacuum for a least 20 seconds if it does not meet this threshold then it will have to be replaced. For canister replacement the vacuum lines have to be identified and disconnected, and the mounting bolts then have to be removed to pull out the canister assembly; to replace it, the process is done the reverse of what is described above.