Is there a fuel injector pump on the supercharged 1997 Buick Riviera If is where car it located?

No, the 1997 Buick Riviera with the supercharged 3.8L engine does *not* have a traditional fuel injector pump in the sense of a separate, mechanically driven pump that pressurizes fuel to the injectors. Instead, it uses a fuel pump located within the fuel tank (an in-tank fuel pump). This pump sends fuel under pressure to the fuel rail where the injectors are located. The supercharger is separate and doesn't affect the fuel delivery system's pump.