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
All vehicles use carbon canister storage for evaporative fuel control. Evaporative emission control system stores gasoline fumes from fuel tank in a carbon canister. After engine is running, fumes are drawn into engine for burning during combustion process.
The basic component used in evaporative emission system are activated carbon canister (all models, open at top or bottom for fresh air intake), vacuum operated canister control valve (some Federal) or purge control solenoid (all other models). For specific component application and vacuum hose routing, see 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.