Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Evaporative Emission Control: Notes
The function of evaporative emission control system is to store gasoline fumes from fuel system in a carbon canister when engine is not running. During engine operation, fumes are drawn into engine for burning during combustion process, purging canister.
Three basic components are used in evaporative emission system:
- Activated carbon canister.
- Computer-controlled solenoid.
- Tank pressure control cap.
For specific component application and vacuum hose routing, see M - VACUUM DIAGRAMS article in the ENGINE PERFORMANCE section.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.