I had this problem in my old GA70 .. The fuel gauge would never go over half no matter how full the car was. In the boot of the car there is a metal plate held down by two screws, under that is a float/spring assembly. This is what measures how full or empty the tank is. It is likely stuck or has moved.Originally Posted by boris
I never buggered around with it as over time I figured out the pattern of the gauge and when it went under half full it started to go down, however for yourself showing full all the time is a bit of a concern and I'd want it fixed.
Here is a link to how it is fixed, but be careful as the site says!!
http://www.supras.com/06/techcenter/display.php?QID=47
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