The 2001 Hyundai Sonata runs on regular unleaded.
From a Hyundai dealer technician- there is no serviceable fuel filter on the 2003 Sonata. The filter is a "lifetime" strainer on the fuel pump in the fuel tank. It would be replaced with the replacement of the fuel pump only. how do you replace fuel pump on the 2003 sonata
under the fuel tank
It is inside the fuel tank.
In THe Gas Tank
The fuel filter on a 2002 Hyundai Sonata is located just outside the fuel tank. It is positioned inline along the frame of the vehicle to protect it.
It will cost you approximately $500 to replace a fuel pump on a 2001 Hyundai Sonata. The amount will vary depending upon who does the work for you.?æ
www.hyundaiusa.com. Register, after you have loged in go to technical info then to service. Use the search. There is a diagram with instructions
The fuel pump is inside the gas tank.
On all Sonata's from 2004 on the fuel filter is in the fuel tank. The fuel pump is mounted inside it and according to the dealer it is a "life time" filter that they only change when replacing the pump or if fuel was contaminated.
2001 hyundai sonata filler tube has slow flow
If you follow the fuel line from the fuel tank to the engine you will find the fuel filter unless it is a permanent filter that is located in the fuel tank. I suspect you will find it has a permanent filter.