The 97 Lesabre doesn't have a fuel cut off switch like some other vehicles do. The test I use is to check for power at the fuel pump harness connector near the fuel tank. When you turn the key from Off to Run the computer will close the fuel pump relay and supply power to the pump for about two seconds then it will turn the relay back off until you actually are cranking the engine over. This is a two person test as you need someone to turn the key to "Run" as the other person is checking for power at the connector. If you have over about 120,000 miles then the odds are pretty good that the pump has failed but It's always best to verify it with a test. Good luck and hope this helps!
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