Famous Check Engine Light On After Filling Gas Tank Ideas. Web typically if a check engine light comes on after filling the fuel tank, it’s due to a vapor pressure problem. At your next fill up, fill the tank until the pump shut.

You can replace the cap if it refuses to click or pops open after clicking. Keep in mind that the fault code that caused the light to turn on in the first place is stored in your car’s onboard. This is because you’ll be interfering with how your vehicle system operates and detects faults in your car engine.





