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I'm assuming you've checked the fuel lines for leaks and the fuel pressure regulator doesn't have fuel dripping out of the vacuum line connection.
Also assuming you've been through the electrical and verified you have good connections and a good fuel pump relay.

You get what you pay for.
Get a Delphi pump if you can find one. Delphi is an OEM supplier. Denso are usually close to Delphi in quality.
AC Delco is no longer affiliated directly with GM and a lot of their parts are now no better than BWD & Dorman for twice the price or more. If you can't find Delphi then give Delco a try.
Rock Auto has AC Delco for around $175. Denso are over $260, and Delphi are near $300 depending on the parts house.
Most of the other aftermarket fuel pumps are darn near worthless.
 

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I was wondering the same thing. I had to break down and buy a beater to get back and forth and haven't messed with the impala but looking to get back to it very soon. That delco on rock auto is much cheaper than O'Reilley's might be worth another gamble. The only thing that I haven't replaced in the fuel system at this point is the lines I feel like. But the fact that it was such a sudden failure with no loss of power leading up to tells me it's got to be something pump related.
If you can swing the extra $20 for the Delphi pump, do it. The Delphi fuel pump modules I've purchased are exponentially better quality than the Delco units.

You need to find the fuel pressure test port and hook up a gauge that can read around double the expected pressure.
This is an '05. It's a Gen VII but may be slightly different from the '01.
 
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I would be sure to check the $14 fuel pressure regulator and the $12 fuel filter before dropping the tank to replace a $200 fuel pump module.
Kind of a miserable job but not as bad or as expensive as the fuel pump module. And. You won't be kicking yourself when you discover it's not the fuel pump module you just replaced for 200 bux and two entire weekends.
You have to remove the throttle body or get a 22mm ??? crows foot wrench (not positive on that size) and bend your arms into an unnatural position to pull the fuel pressure regulator on the 3100 3400 engines. Ends up being six of one and half dozen of another. Same amount of time either way. Turning things 1mm at a time is like fingernails on a chalkboard for me. LOL
 
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