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 Emissions System: Operation: Notes
As vapor forms in the fuel tank, it passes thru the liquid-vapor separator. The function of the liquid-vapor separator is to return liquid fuel to the fuel tank and allow only vapor to enter the carbon canister. The vapors exits the separator via the vapor lines. From the vapor lines, it enters the activated charcoal canister. When the engine is started, air is drawn through the bottom of the canister to extract the vapors from the charcoal and induct them via the carburetor. There they become part of the air/fuel mixture and are burned in the combustion process. The components of the evaporation system and their function are as follows:
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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.
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