It could be a few things causing it not to get gas, if that's the issue 1) faulty petcock, 2) sediments in tank blocking petcock inlet tubes, 3) stuck float valves.
Since it's a 96 first thing I'd do is remove the petcock and clean it and the tank, then install an inline fuel filter. Put it on PRIME and see if fuel flows threw the line - remove the line from the carbs and put it in a jar or something else to catch the gas. If that works the next step would be to remove the carbs and clean out the bowls and the float valve. As long as you have the carbs apart clean them as long as you have the mechanical ability to put them together properly and adjust & synchronize them afterward.