When i got home i noticed gas leaking from under the car on drivers side. The charcoal canister had filled with gas and was overflowing. What caused this?

Possible kinked or clogged vent tube. Either on the filler tube or the vent on top of the tank. Causing back pressure.

Usually caused by failing to tighten gas cap after filling up; however, it can be a leak anywhere in the evap system. The system traps gas vapors that leave the tank during fillups and warm days by passing them into a charcoal canister. While driving, the car's computer opens a valve to draw the vapors from the canister to burn in the engine. If any of the hoses or the canister leak, this code will also be set.

May have flowed into the EVAP system or charcoal canister and is causing a rich flood issue.

If this is related to the fuel filling, evaporative canister issue, maybe the following will help. Most of the components for the fuel tank are located near the tank itself, with some near the front of the tank and the evaporative canister components behind the driver side rear wheel inside a splash cover.

The biggest problem people complain about is not being able to fill the tank without the pump stopping if the tank is filled at a higher rate than a trickle. This issue is caused by trying to overfill the tank after the fill nozzle has clicked off causing fuel to damage the evaporative charcoal canister clogging it and causing the blow back to the filler neck and fill nozzle, simulating a full tank shut-off of the filling process. This is not exclusive of Hyundai, and gas pumps usually warn of overfilling the fuel tank because of this known result. This evap containment mechanism was developed for the cars to replace the vapor collecting mechanism that gas stations used to use partly for the fill nozzle and collection dangers, now all that vapor is collected and safely burned when the engine is running. The evap canister can be expensive to replace, in the neighborhood of $150 from the dealer, and it's not recommended to try and bypass the system or you can create more issues than you solve.

Visit https://www.hyundaitechinfo.com/ to get service info for your vehicle, it's free and very useful.

If this isn't related to your issue, sorry, maybe you can post more info on what the issue is and how you need help.

replace charcoal canister and prob canister close valve as well to be safe.

Replace the fuel deliver valve, it is under the truck on the drivers side, it is a black plastic canister with lots of plastic lines going in and out of it. If you find this is the problem disconnect one line at a time, don't take everything off at once and mix them up.

One of the most common causes, is blockage in the venting system from fuel entering the vent lines and into the charcoal canister, the fuel gets absorbed by the charcoal canister causing it to swell and block vent lines. the gas tank contains both fuel and air. when you fill it up the gas displaces the air and the air has to go somewhere. but the air that is displaced is full of gas vapor so the gas vapor goes to the vent lines and into the charcoal canister, when the charcoal canister swells up it prevents the air from escaping the tank, canister could be clogged,canister filter may need replacement,electrical connection to the close valve may be open,canisterf might be damaged,purge valve from canister might be clogged,vent hoses might be clogged, the vent hose could be clogged, or the vent hose may have a kink. all this is caused by overfilling the gas tank, getting that last drop of gas in the neck of the fill tube.
good luck!

your truck is equipped with a purge system, this system vents the fuel tank into a charcoal canister that holds all the vapors from the fuel tank and then wile driving the canister dumps those vapors into the engine so they can be burned, so with all that said you either have a leak in the hose that is going from the tank to the canister or in the canister itself.

May be nothing more than a faulty gas cap or vent hose from the tank to the filler neck. Your charcoal canister for the fuel evaporation system may not be purging. It could be filling up with gas. It will eventually overflow, allowing you to see the problem.

thats the fuel filter need to replace or check the lines