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We are assuming that you are talking about Fuel Pump Relay; so, take the plastic cover off the Power Distribution Center. There may be a plastic tab retaining the cover, depending on the model LeSabre you have. With the cover removed, stand before the power distribution center so that the square relays within it visually appear horizontal.
Locate the fuel pump relay in the lineup of relays within the power distribution center. If you're looking at the relays from the correct position, you should see two horizontal rows of five. Count from the right over to the third relay in the top row. This is your LeSabre's rear defogger relay; directly below it is the fuel pump relay. Disconnected and connected again to electrical reset it.
Additionally, this video could be helpful,93 Buick Lesabre fuel pump relay location...