No, you generally do *not* have to drop the fuel tank on a 2003 Saturn to replace the fuel pump. Access is usually from inside the trunk or cargo area. There's an access panel specifically designed for fuel pump replacement. However, the exact procedure varies slightly depending on the specific Saturn model (Ion, L-Series, Vue, etc.).
Before starting any work, always consult a repair manual specific to your *exact* 2003 Saturn model year and trim level. This will provide the most accurate and safe instructions. Improperly working on a fuel system can be dangerous.