I think your confusing crank and turn over. When you turn the key to the start position the engine
spins, that is called cranking, many call it turning over. After it cranks a short but it should start. So your concern as I see it is a crank no start concern.
We need to figure out what the engine needs but is not getting. Those are fuel pressure, ignition spark, and injector pulse. This HAS TO BE DONE when it will not start.
I recommend the fuel pressure being the first test. With the key on, during this no start issue, the pressure should be 30psi or better. If not then we need to see if the inertia switch has battery voltage. If so then its your pump to blame since its been verified to be getting power.
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