Does the car drive any differently...do you see or suspect any problems from it besides the light being on? If not, you might try resetting your codes and see if they come back. Otherwise, obviously there is something going on with the fuel level sensor and/or fuel pump. You can test fuel pressure by pushing in the shrader valve at the end of your fuel rail (like letting air out of a tire) and see if fuel squirts out (hold a rag over the end to keep fuel from sparying everywhere).
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1998 S70 T5 Emarald Green Metallic (125K), 2004 V70 2.5T Ruby Red (45K), Previous Owner of Black '94 850 Turbo Wagon (Sold at 140K and miss her). My cars have been running so well lately they've got me worried.