Evaporative Emission Control: Notes
NOTE:
Not all listed components are used on every vehicle system. Component usage depends on calibration of vehicle.
The function of evaporative emission control system is to store gasoline fumes from fuel tank in a carbon canister when engine is not running. During engine operation, fumes are drawn into engine for burning during combustion process, purging canister.
Four basic components are used in evaporative emission system:
- Activated carbon canister.
- Vacuum-operated canister control valve.
- Computer-controlled solenoid.
- Tank pressure control valve.
For specific component application and vacuum-hose routing, see VACUUM DIAGRAMS article in this section.