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To try and narrow down where the problem is we need to do some tests.
First thing we want to do is a spark test. Get a spark tester from your local auto parts store, an adjustable model is best. Put it on the top spark plug wire and have a helper crank the engine over. Do you have spark? If not check the stop switch first.
Next we want to check for fuel.
There is a schraeder valve on the fuel rail. Put a rag over it and depress it. Do you get fuel?
Have you checked the fuel filter for for water and trash? How old is the fuel?