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If it won't fire with Ether its ignition.
If you have healthy spark and it will fire with engine starter fluid (Ether) but dies after 3 seconds its fuel delivery related.
That doesn't mean fuel pump though, it could still be electrical, aka injectors.
Test the injectors with a voltmeter in the injector plug,
I get 5V when cranking.
If you get juice to the injectors and can hear/feel them clicking I'd say its the pump, even if you can hear the pump run that don't translate to sufficient pressure to pass the injectors.
If you have the 2 pump system its better to swap both.
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