Fuel gauge on empty when temperatures are hot

[myturbo6 at yahoo.com (Eric Singer)]

My fuel gauge during the winter was working great, but this spring things have been a bit different.  In the morning when I crank the car it reads correctly and everythings great, but later on in the day when outside temperatures go up it reads dead on empty when I crank the car.  I haven't driven the car for hours and it's just sitting in the parking lot.
   
  Anyone have this problem with their fuel gauge before?
   
  Thanks,
  Eric Singer
  '87 16V Scirocco

       
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