fuel pump on 2003 Buick Rendezvous

I just put a new fuel pump on my car it started up a few times but now it won't start up at all

Asked by for the 2003 Buick Rendezvous
Hi, I have a few questions,
Why was the original fuel pump replaced?
How do you know it needed to be replaced?
What is the current fuel pressure reading?
2 answers
This car is junk I got every singal issuse wit my car and this one just adds to it.GOOD LUCK GET FULL INSURANCE RUN CAR INTO TREE!!