What are the current symptoms?

If it is a crank no start, you can have someone crank it while you crawl underneath and hit the fuel tank with your hand or a rubber mallet. If it starts, most likely the fuel pump. You can also crank it and spray some brake/carb clean in the intake to see if it will fire. That year of GM anything was notorious for bad fuel pumps.

The job isn't hard if the tank isn't full...