I need to change my fuel filter where is it?

Special procedures: You must relieve the fuel pressure.

2.4L disconnect the fuel pump harness in the trunk

2.5L disconnect the fuel pump harness under the rear seat

Then start vehicle till it stalls -now the pressure is relieved turn key off.

The fuel filter if its not near the fuel pump then its under the brake master cylinder up against the firewall.

The washer is the new seal when you disconnect the fuel filter

My references Ondemand says if its not upfront its near the fuel pump-near the fuel pump can be a touchy subject inside or out-best bet is to investigate where back there.

Didn't mentioned whether its underneath along with the fuel lines. In todays vehicle they normally located inside the fuel tank with the fuel pump.

Under the vehicle at the left front corner of the fuel tank.

FUEL FILTER REPLACEMENT
1.Reduce the internal pressure of the fuel lines and hoses and perform the following operations.
*Disconnect the fuel pump harness connector in the trunk room.
*Start the engine and, after it stops, turn the ignition switch to OFF .
*Disconnect the battery negative (-) terminal.
*Connect the fuel pump harness connector.
2.Remove the two fitting nuts while holding the fuel filter nuts securely.
3.Remove the fuel filter mounting bolts, and then remove the fuel filter from the fuel filter clamp. Tightening torque Fuel filter fining nut 25 - 35 Nm (250 - 350 kg.cm, 18 - 25 lb.ft)

The reason your gas is not allowing you to fill up is the vent control valve. It is stuck closed.

Replace the vent valve.

I would address the 302 miss fire code. It sounds like you need a tune up

Roy

The vent valve is located on the fuel tank. It works like a 2 way valve. Its supposed to allow fuel in and not let fuel out.

You need to drop the gas tank in order to remove and replace the vent valve.

I wouldn't recommend performing any work with fuel if you're not sure what you're doing. Fuel vapors are highly flammable and can cause serious injury if not using the proper precautions. I would take it to a pro to perform. It is a little labor intensive if you do try to do it yourself especially if you only own a jack and some jack stands. The exhaust needs to be removed, they're should be an access panel either under your seat or in the trunk area right behind the seat under the mat to disconnect the fuel lines. Make sure to bleed down the fuel pressure before disconnecting any lines and then disconnect the vehicle battery to eliminate any possible electrical charge that may cause a spark around the fuel tank. There will be 2 gas tank straps that need to be removed but before removing them completely, you need to support the gas tank or it will fall and break off the fuel lines that need to be disconnected. I would strongly suggest doing this all with at least 2 people if you do it yourself.

I don't recommend using anything other than an actual spark plug socket to remove spark plugs because the socket centers the the spark plug when you are applying pressure to remove it or install it. Its also used to hold the spark plug onto the socket when you're putting the new spark plug into the tube without damaging the ceramic. I would pick one up at a local parts store. It shouldn't be more than $10 for a store brand one. Also make sure that you are using NGK spark plugs and wires. Hyundais operate best when used OEM equipment and prevents premature failure and proper operation. I just worked on a vehicle today that had a misfire and the customer replaced the wires and the spark plugs with brand new aftermarket ones. The brand was Autolite. After he replaced them, he still had a cylinder 1 misfire and brought it to the dealership. I removed the spark plugs and wires and found that the brand new wires had already started arcing causing a major misfire and the spark plug was covered in raw fuel from improper combustion. Not trying to scare you, but for some reason, Hyundai vehicles are very sensitive when it comes to using aftermarket parts. As for the throttle position sensor, it should be as easy as removing the old screws and installing the new sensor in the reverse order you removed the old one. While you're in that area, I would also take the time to clean the inside of the throttle body including the throttle plate and where the throttle plate sits. This will insure proper throttle response.

Fuel filter is under the hood. Fuel pump is in the tank and the tank has to be dropped for access to pump.

After replacing all fluids, before you pull the fuel tank down, Check for spark and check for fuel pressure at the fuel rail. Should have about 46-49 psi at the rail.