METHOD AND SYSTEM FOR DIAGNOSING EVAPORATIVE EMISSIONS CONTROL SYSTEM

Methods and systems are presented for diagnosing operation of an evaporative emissions system that included two carbon filled fuel vapor storage canisters that are arranged in parallel. In one example, operation of a first canister vent valve, a second canister vent valve, and a canister purge valve are adjusted to diagnose breaches and obstructions within the evaporative emissions system.