Hyundai Repair: Check engine, gas tank, fuel vapors, charcoal canister

Question
QUESTION: I just bought a 2002 Hyundai Accent, 1.5 L, manual trans, it has the "check engine" light on, I took the car to Autozone and in the presummed causes is the oxygen sensor, they showed me the part, and they told me that it could be next to the catalyst, if this something I can do, if so, how do I do it, and I'm having a big problem trying to fill up my gas tank, it's like it's full of air, the gas pumps always stops, not even 1 gallon I can pour, well I have to do it with a lot of patience and little by little, what could be the problem? it's driving me nuts, it takes me like 25 min to fill up the tank. Thank you in advance for your help.
Regards

ANSWER: Hi Ronald.  It appears that a previous expert left and the questions he didn't answer were simply dumped into the system.  If I remember correctly, you asked me this question and I provided an answer.  If I'm incorrect or you need additional information, please follow-up.

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QUESTION: Hi there, thanks for your help,what should take a look when it comes to the gas problem? sorry, but all the technical words?? is like a small hose?? a filter? where are they located? and can I fix it myself?? Please let me know.
Thank you very much

Answer
There are many things to be looked at actually.  You'll need to inspect all the plumbing leading to the tank from the filler neck, making sure that nothing is pinched or crimped.  You'll also need to verify that there is no physical damage to the area of the tank where the fuel enters.  These things can restrict fuel flow into the tank.

Presuming that's okay, you'll also need to inspect all the plumbing between the tank and the charcoal cansiter area (the large black box underneath the left rear of your car).  This must also be in good condition and not pinched or restricted, as it will prevent the fuel vapors from being pushed out of the tank.  The canister filter is inside the same plastic cover that holds the charcoal canister.  If you're game enough, you could try to remove it and blow through it.  You should be able to do so with little resistance.

The above is probably the most you'll be able to do yourself.  The problem you're having filling your tank often requires significant diagnostic time, even by a well-schooled professional.