If you've picked up some Water in the Gas when you topped off the Tank that could be causing the trouble, It's not uncommon at least here in the UK to get some badly contaminated Fuel resulting in a poor running Bike Or Car.
Strange that the Fi light would come on thou unless it's picking up a bad sensor reading due to the motor running rough.
If it started directly after your fill then i would suggest a rather tedious strip and clean all associated fuel system components and try that, Should be no need to touch the Injectors they will run through pretty easily.
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