First thing is first, get yourself a fuel pressure gauge, I'm sure you can get a cheap one at harbor freight for your one time use. Do you have fuel pressure? If yes it's not the pump, if no check for power to the pump on intitial key on. If power and no pump sound or pressure then you need a pump (also check for ground just to be certain). Pretty simple. If no power then backtrack to the fuse, if power on one side the fuse and not the other then you have a blown fuse, if no power on either side the fuse? Back track to the relay. The rest of your stuff like changing the oil for metal shavings is wasting your time and could have used that 50.00 in oil for the pressure gauge, if the engine was seized (the whole point looking for your shavings) the starter would not even crank the engine.
Diagnosis is a process of deductive reasoning. Eventually you will find what is missing and why.
To get an engine to start you need air, fuel, compression and spark. If fuel pressure and no spark then chase the spark. If fuel pressure and no injector duty cycle then look at anti theft (not positive if the z cuts fuel or doesn't command starter relay for its anti theft). Fuel and spark look good then you have to dig deeper into mechanical (compression test).
Good luck but first thing I would check is an ex fuel pressure check to get an idea where you need to go.
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