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.
Fuel Evaporation System: Operation
When ignition switch is in "OFF" position, fuel tank and carburetor float bowl vapors are vented into charcoal canister. When engine is running above idle and warmed to normal operating temperature, thermo valve will open and allow vacuum to open purge control valve.
Canister vapors are then drawn into intake manifold through purge control valve for burning. Purge control valve is kept closed during idle and engine warm-up to reduce HC and CO emissions. On Mirage Turbo, purge control valve opens when the pressure difference between the turbocharged and throttle-port pressures exceeds a preset value.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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