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Never assume there is gas in the tank, always add some.
Could be there is no fuel getting into the pump in the gas tank, clogged "sock", it's the screen around the fuel pump that prevent debris getting sucked in.
The "sock" can get completely clogged on older vehicles.
Remove the fuel line from the fuel pump in the frame rail and turn on the key, pump should run for two seconds and you should get a good amount of fuel out in that time.
If no fuel then either sock in tank is clogged or fuel pump is running but not working.
There may also be a reservoir/filter in the frame rail, they can get clogged up as well