Sounds like an charcoal filter or canister. The charcoal absorbs the petrol vapours . The solenoid valve opens to allow the vapours to burn once the engine is warm & over a set RPM.
The ECU controls that.
http://blog.widiyanata.com/en/autom...ter-functions-pictures-and-how-it-works/


JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"