Canada

Fuel Filler Cap/Fuel Tank Vacuum Relief Valve:

FUEL FILLER CAP/TANK VACUUM RELIEF VALVE TEST
1. Wipe clean valve housing.
2. Suck air through the cap. A slight resistance accompanied by valve clicks indicates that valve is in good mechanical condition. Note also that, by further sucking air, the resistance should disappear with valve clicks.
3. If valve is clogged or if no resistance is felt, replace cap as an assembly.