Fuel Gauge Stuck on Full

[thstone]

1997 Boxster.

For the past year, I've had the problem where the fuel gauge displays 3/4 tank anytime that the tank is 3/4 or more full. It seemed to work normally below 3/4.

Now, the fuel gauge seems to be stuck on full. Last week, I drove the car in the canyons and when I got back the gauge was still on Full - and took 8 gallons until auto-shutoff. Drove it again in the canyons this week and it should be down to at least 3/4 and still shows completely Full.

The gauge moves up and down when I power on/off the car.

Ideas? Looks like its time to pull the sending unit...