The fuel pump relay location on a 1996 Buick Roadmaster is in the
underhood fuse block, also known as the power distribution center (PDC). It's not always clearly labeled, so you'll likely need to consult your owner's manual or a wiring diagram to pinpoint the exact relay. The manual will show a diagram of the fuse box with the relay locations and their functions.
Unfortunately, without a diagram specific to your vehicle, I can't give you a precise location within that fuse box. The relay itself might be identified by a number or symbol referring to the fuel pump system.
