1. Consult your owner's manual: This is the most reliable source. The manual will specifically show you the fuse box diagrams and locations for your particular Suburban.
2. Check the fuse box(es): Suburbans often have multiple fuse boxes: one under the hood and one inside the vehicle (often under the dash or in the center console). Look for diagrams inside the fuse box lids; they usually show which fuse controls what. The fuel pump fuse is often labeled, but sometimes it's just a number. If you find a label referring to "fuel pump," "EFI," or "injection," that's likely it.
3. Look for online resources: Search online for "[Your Suburban Year and Model] fuel pump fuse location." Many forums and websites have this information.
Important Note: Before working with any electrical components, disconnect the negative battery terminal to prevent accidental short circuits or shocks.