Symptom hub
Engine Runs Rough After Refueling: Purge Flooding vs Canister Saturation
A rough restart, rich stumble, or shaky idle right after adding fuel usually means vapor is entering the intake when it should not. In practice, that pushes a purge valve that will not seal, an overfilled canister, or an EVAP pressure/vent problem much higher than random ignition guesses.
Likely related codes
Start your diagnostic path here
P0172 — System Too Rich (Bank 1) P0441 — Evaporative Emission Control System Incorrect Purge Flow P0496 — Evaporative Emission System High Purge Flow P0440 — Evaporative Emission Control System Malfunction P0451 — Evaporative Emission Control System Pressure Sensor Range/Performance P0453 — Evaporative Emission Control System Pressure Sensor High Input P0444 — Evaporative Emission Control System Purge Control Valve Circuit Open P0445 — Evaporative Emission Control System Purge Control Valve Circuit Shorted P0497 — Evaporative Emission System Low Purge Flow