I had a 1999, 2001 and sister has a 2002 Sonata. All 3 cars were subject of rusted out frame recall. All 3 cars have gas tank and gas line leaks due to rust. Hyundai USA disavows any problems with tanks and lines. Any others out there with same iisue. Dealer cost to replace tank and line....$2,100.

 

I could be wrong but I believe the tanks are a composite plastic and can't rust.