adrianfischer7

Peugeot 408 Fuel Tank Ventilation Leak

My 2023 Peugeot 408 hybrid has an intermittent check engine light and occasional stalling, especially when idling. The car has 115458 km on it. I suspect a fuel tank ventilation system leak. Could a defective activated charcoal filter be the cause, and what impact could this have on fuel efficiency, air flow, and potentially lead to a more severe system failure?

4 comment(s)

A ventilation system leak, huh? I had something similar happen with my Peugeot 408. Check the EVAP system. What kind of airflow are you getting? Is it consistent? Is there any hissing from around the fuel tank after you've been driving?

Hissing from the fuel tank? I haven't specifically listened for that. Did you experience that with your car? Could you elaborate on what you ended up finding?

Yep, that hissing was a big clue for me. It turned out to be exactly what you're thinking: the charcoal filter in the EVAP system. If your car's acting up the same way, and you get that hissing, you should probably just take it to a workshop. It's easier than chasing ghosts.

I took your advice and brought it to a trusted mechanic. It turned out to be a defective activated charcoal filter, just as we suspected. The final repair bill came to 275€. Thanks a lot!

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