We have did some research on this and believe it to be a problem with the car being overfilled with gas at one time or another. It seems if overfilled it runs back into charcoal canister which stops up the lines and then the problem begins.
I have talked to Hyundai and the parts alone for this is $280.00 plus labor. I am just dealing with the issue at this time because I have other pressing matters, but man is this annoying!
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there is a fuel float in the tank just like in the back of a toilet. you have to pull up back seat cushions to get to it i believe. it will be a round plate type with a couple wires coming out. undo it and pull up the float and probably pump too, i dont know if the pump is in tank or out on that car. its easy enough you dont have to pay someone to do it. good luck
You probably have a ground wire not making contact to ground on the front tank sending unit. OR the sending unit itself inside the tank is faulty. Either way, when a gas guage goes to full all the time (empty or full), this indicates that NO ground is available for the sending unit.
the gas tank is under the back seat.. to get to it u have to go under the car and everything sould be down thr.. (note) thr is a lil rubber plug on the tank faceing to back of the car.. DONT FULL IT! its hard to find a replacement and its a pain to only use a half take at a time.
The problem is that there are updates for the computer in your vehicle.The dealership can do what they call a flash and install those updates.The bad part in my opinion is that they dont inform the public of this and they will try to sell you a new computer when you dont need it.
Unfortunately this is most likely the fuel pump module, which includes the fuel level sensor also. This should be diagnosed more thoroughly with a scanner, a good scanner will be able to check instrument cluster separately to confirm the gage is working right,and check for trouble codes that may not light any warning lamps. Hope this helps. Rate me please.P.S. Dont use that fuel station any more.