Issue after filling up gas

Guys-

Need some help diagnosing this:

Everytime i fill up, I start the car, and the gas needle starts to rise, and then it gets up about half way and says Service Fuel System-CEL comes on, and then it shows that I am empty and then half way full then empty back and forth.

Eventually after some gas gets eaten up, it goes to where it should go, and CEL goes away.

Now I have another CEL from something else (I think) that I also have to deal with.

Any Ideas?

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Issue after filling up gas