Where is the fuel pump relay switch on a 1991 Corvette?

The fuel pump relay location on a 1991 Corvette is in the underhood fuse block, often referred to as the Power Distribution Center (PDC). It's not a separate, easily identifiable switch. It's a relay within the fuse block itself. You'll need to consult your owner's manual or a wiring diagram to pinpoint the exact location of the fuel pump relay within that fuse block. The manual or diagram will show the relay's position and will likely identify it by number or description.