I agree, it sounds like the strainer in the fuel tank may be clogged, so the pump can't get any fuel. If you remove the fuel line from the first filter, upstream of the fuel pump, you should get a flow of fuel from the tank. Just to make sure, how muck fuel do you have in the tank? Sometimes clogged strainers become an issue when the tank is near empty.

Also, someone had a similar problem due to a plugged tank vent. Try it with the fuel cap removed to see if that's your problem.