Hi,
Have you checked for both spark and fuel to the engine? Will it start for a couple seconds if you use starting fluid?
Take a look through these links. I suspect that since it happened all at once, either the fuel pump has failed or you lost ignition spark. Here are links to help. If you do try the starting fluid trick, let me know what happens.
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https://www.2carpros.com/articles/car-cranks-but-wont-start
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
https://www.2carpros.com/articles/how-to-test-an-ignition-system
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Also, here is a link that explains how to retrieve diagnostic trouble codes. It doesn't require a scanner on this vehicle. All you need is a short jumper wire or even a paper clip. I recommend doing this as well.
https://www.2carpros.com/articles/buick-cadillac-chevy-gmc-oldsmobile-pontiac-gm-1983-1995-obd1-code-definitions-and-retrieval-method
Let me know what you find or if you have other questions.
Take care,
Joe
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Tuesday, November 26th, 2019 AT 8:10 PM