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The fuel pressure might be low, that is normally caused by a defective fuel pump. Since you changed the pump does it have the pressure bar reading as the old one. If it's the same reading probably you might have been supplied with a defective product.
Remove the return pipe and crank the vehicle, if nothing comes out from the return pipe then your fuel pump is definitely a problem
Maybe your problem is with the one or many injectors, if just one is bad, you will have problems. Get yourself a multimeter and set it to read in ohms and find what spec the injectors should be at. If out of spec, then you need to replace that one injector(s).
If it doesn't turn over it may be your starter going. or a weak battery. start with that first, insufficient fuel pressure won't prevent you car from cranking, but weak battery or bad starter will. If you can jump it and it starts its probably the battery if it doesn't crank then its probably the starter. Good luck
I would visually check for spark at the plugs, to make sure spark is getting to the plugs. If spark everywhere, use a gage and check proper fuel pressure and fuel injector pulse.
How long since a tune-up? Any applicable trouble codes?
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