Hey, where is the fuel filter on my 2001 Elantra?
Has anyone replaced it themselves?

Look at the thread about the '99 fuel filter placement. If it's not in that location, it's in your fuel tank along with the fuel pump.

Has anyone replaced the fuel filter themselves? If so what brand was used?

I've done mine, but I don't remember what the brand was. It was from an auto parts store (Checker, AutoZone, Parts Plus etc). Pretty much any auto parts store should be able to get one for you, and it will be much less expensive than a Hyundai one from the dealer.

The fuel filter on the '02 is in the fuel tank so I would assume since the '01-'03 models are pretty similar that it would be there too.