After fill-up did you top it off? Did your check engine light blink a few times before it remained lit? I used to top off and get the CEL come on ... maybe too much pressure. The light would eventually go off after a few "trips".

Check to see if your gas cap is screwed on tightly .. the blinking CEL alerts you to this. If the engine is running fine, drive the car thru a few more cycles and see if the light goes out on its own.

Good Luck

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-Paul-
'01 E430, Sport 72,000 mi
'98 C280, 126,500 mi