Where is the fuel pump reset button located on a 1991 buick regal custom?

There is no fuel pump reset button on a 1991 Buick Regal Custom (or virtually any car). Fuel pumps are controlled by the car's computer and operate automatically. If your fuel pump isn't working, the problem is likely a faulty pump, a blown fuse, a problem with the fuel pump relay, or a wiring issue. You'll need to have it diagnosed by a mechanic.