Buick Vapor Canister

The canister stores fuel vapor; the purge valve controls its flow toward the engine. Some designs combine components, but a canister listing does not automatically include every valve in the EVAP system.

A restriction in the tank vent path, a collapsed hose or a nozzle issue can interrupt filling. Mitsubishi service information identifies several possible causes, so the symptom alone does not identify a bad canister.

Overfilling can allow liquid fuel into the EVAP system on affected vehicles. Stop fueling as directed by the vehicle manufacturer and have a saturated canister diagnosed rather than assuming it can store vapor normally.

Package contents depend on the design. A replacement canister can be supplied as the canister itself or with attached components, so identify the valve and fittings needed for the specific repair.

A leak or fault in a hose, valve or other part of the evaporative system can also set an EVAP code. The code is a starting point for diagnosis, not a guarantee that replacing the canister will resolve it.