The fuel pump relay location for a 1990 Pontiac Bonneville is
under the hood, in the underhood fuse block. However, it's not always clearly labeled as "Fuel Pump Relay". You'll likely need to consult your owner's manual or a wiring diagram to identify the correct relay. The manual will show you the fuse box layout and indicate which relay controls the fuel pump. A wiring diagram will be more precise and show the relay's connection to the fuel pump.
Without your owner's manual or a wiring diagram, pinpointing the exact location within the underhood fuse block will be difficult. The relay might be labeled with a number or code rather than a descriptive name.
