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First, the power relay turns on engine computer. Then the engine computer turns on the fuel pump relay which in turn, turns on the fuel pmp for 5 seconds, unless the engine is running. If you have a new pump, check for spark right after it dies next time.
If you have spark and fuel (either via the injectors or spraying fluid into the intake), and still no evidence of firing, it suggests your valvetrain may not be working. If the valves can't open, the fuel cant get into the cylinder.
Do (or have done) a compression test. You may have a broken timing belt/chain.
Fuel filters are cheap (less than $20.00 for the premium filter at Napa) and easy. If you've never changed it, you should do it anyway. It would at least make sure that it's not the filter if the problem still exists. On the bonus, you've got a new fuel filter.
This to me sounds like it could be the fuel pump but first I would check the simpler solution and make sure your alternator is good because if your started turns over fine but the car wont start the next part to check would be for me the alternator.