Just to add what I'm learning about this issue, which my car has as well (full = 5/8 reading), I read that there is a fuel tank vent valve can be bad or the fuse for it (E8??) has burned out.
I have also discovered that my tank wasn't totally full when the pump clicked off automatically. I had to dribble in the last gallon or two to get it to fill up and raise the needle to 7/8.
However, I still have a problem with an accurate reading. Just once since I replaced my sending unit and had it calibrated by my mechanic (requires a PST tool) has the car read 4/4 when it was full. Grrr!
One other issue is that when I am at 1/4, the low fuel light comes on brightly. Seems a little premature, even though one should not run to empty in our cars (remaining fuel keeps the fuel pump cool and from overheating).
I have yet to check my fuses, but I just might go home tonight and make a bee-line for the garage to check this out.
This problem has always frustrated me about owning my car!
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