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You should do a pressure test as mentioned above.

However I have a 2003 S10 4.3 Auto. The fuel pump was whining on it, I changed the fuel filter and it still remained. I kept driving it anyway. Eventually it started giving issues with it's first/cold start it would have an extended crank before it finally started but after that it would fire right up again until the next day it repeated.

I ended up replacing the fuel pump with a US Motor Works pump because I knew either way whether the first/cold start issue was fuel pump related or not that the pump was going bad to begin with.

Well after replacing the fuel pump that issue is gone it fires right up every time no problem even after sitting for days. The fuel pumps on GM vehicles of this era do tend to fail around the 100,000 mile range some get lucky and they last much longer.

If it does end up being your fuel pump be sure to replace the fuel filter as well, you may want to just go ahead and replace the fuel filter anyway it is a maintenance item and is due around every 30,000 miles it could actually be your problem and it is cheap.
 

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Interesting, yeah I'm at about 140k miles so I might want to pay good close attention to the pump. Like I said above I'm going to replace that filter for sure regardless, and I'm not sure if the pump had been replaced before since I sadly don't have any service records with it. But these filters seem decently cheap and easy to replace so I'll get that filter on ASAP. This one has definitely been on for more than 30K by the looks of it.
When it doubt change it out in regards to fuel filters. A lot of people fail to replace the fuel filter but they do not understand how important it actually is. Not only does it protect your fuel system by obviously filtering but if you do not replace it, it can start to clog up and even a partial clog will start putting excessive strain on the pump and eventually weaken and burn it up.

As for if the fuel pump has been changed before or not, if it was changed it will have a new connector spliced on to it but it doesn't mean it is not bad if it has been replaced before because it could have one of those cheap $30 pumps.

And if you do end up needing a pump RockAuto has AC Delco/GM Genuine which is OEM for $150 to $187

They also have US Motor Works for $87 and while I cannot speak for everyone else I can say my experience so far with the US Motor Works is excellent, no problems at all from it but time will tell for certain on that.
 
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