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: Description
Fuel evaporation system prevents escape of raw fuel vapors to atmosphere. A fuel tank with integral vapor separator is installed on GLC and 626 models. B2000 models are equipped with a vapor valve instead of a vapor separator.
Additional components of system include a check and cut valve (except B2000), an air vent solenoid valve (except B2000), 2 purge control valves (only 1 on B2000), a charcoal canister, a fuel filler cap, a water thermo valve, and connecting lines and hoses. A vacuum controlled evaporative shutter valve is installed on B2000.
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.