Symptom hub
Misfire After Refueling: EVAP Flooding vs a True Ignition Problem
A misfire that appears right after getting gas deserves a different diagnostic order than an ordinary random misfire. That timing often means excess fuel vapor is entering the intake through the EVAP system, even when the scan tool only shows a generic P0300 at first.
Likely related codes
Start your diagnostic path here
P0300 — Random/Multiple Cylinder Misfire Detected P0172 — System Too Rich (Bank 1) P0441 — Evaporative Emission Control System Incorrect Purge Flow P0496 — Evaporative Emission System High Purge Flow P0451 — Evaporative Emission Control System Pressure Sensor Range/Performance P0453 — Evaporative Emission Control System Pressure Sensor High Input