My 2001 Accent is similar, although it grazes the full mark when
overfull  it immediately starts a slow downward movement. i would call
it quite accurate  even though i preferred the old Mazda i had 15
years ago that would sometimes go 100km before moving from overfull.
i'd say Hyundai may have changed the Accent's sender unit in 2002
because of this reason. i wonder if the Sonata is getting a change?

I have a webcam in the tropics
http://ii.net/~farmerjim/

GEE, I thought it was just me! LOL
My '00 Sonata(V6) does exact same thing.

"FerdyPooh" <fredjr1@bellsouth.net> wrote in
I have the same problem with a 04' Elantra. It rarely shows full and is
already at 3/4 after about 20-40 mile of driving.

news:BkuFc.3680$bj2.2066@bignews5.bellsouth.net:

When full my 2003 will indicate FULL on the gauge and upon drive the gauge
immediately starts going down. I have found it impossible to top off  the
tank as the fuel will come out of the filler no matter how careful you are.
Bob

My '04 Sonata does the same thing. It really worried me at first. It
looked like my mileage was HORRIBLE, after maybe 40 miles I was down
to near three quarters of a tank. But when I would fill up, my actual
mileage was just fine. It's just at the upper range the gauge is
wildly inaccurate. Now that I KNOW that, it's okay. I called the
service manager at my dealership, and she told me it the gauge still
reads that way at first warranty service at 7500 they would see if
something was wrong. She phrased it in such a way to make it sound as
if the gauge adjusted during use and became more accurate. Now, that
makes NO sense to me, but she has been dead bang on as to other
questions I had.

yes same with my '04 getz
peter