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Under the left side of your back seat is a fuse / relay box . When you first turn the key on the fuel pump relay turns on for a few seconds to prime the fuel system . That relay is in that fuse / relay box ,that is what your hearing . Does the vehicle start an run good , no problems other then the buzzing sound .The vehicle battery is also under the rear seat on the right side . How To Locate and disconnect Battery Buick Lesabre Pontiac Bonneville 00...
Its the relay in the fuse box by the passenger side floor board. Remove the kick plate and its either white relay on the top (one is mounted horizontal on the right or rear position and vertical on the front or left. Its $6 bucks at Auto zone. You can switch both of them around and the truck will start and run till you get the replacement. Steve
I think you are on the right track. I would take the relays to Autozone or another parts store and see if they could determine which if any was bad. If you can find a relay that is the same size, amperage, and has the terminals in the same spots - you could swap them and see if the fuel pump works then.
If the relays don't solve the problem - you could have a loose wire in the fuse box which could require a little bypassing of circuitry or even a new section of wiring harness. Lets hope not. Good luck.