To find it, you need to:
1. Consult your owner's manual: This is the most reliable source. It will show a diagram of your fuse box(es) with the fuse locations and amperage clearly labeled.
2. Look at the fuse box diagrams: These are usually located on the inside cover of the underhood fuse box, and sometimes in the under-dash fuse box. Look for fuses labeled "Fuel Pump," "EFI," or something similar. Pay close attention to the amperage rating, as there could be multiple fuses with the same amperage and/or label.
3. Use an online resource: Websites like RepairPal or forums dedicated to S10 Blazers might have diagrams specific to your year and engine. Be sure to specify your exact year, engine, and cab style for the best results.
Without your owner's manual or a specific engine type, it's impossible to give a precise location. Checking both fuse boxes, referring to the diagrams within, and using online resources tailored to your truck's specifications are the most reliable ways to find the fuel pump fuse.