I have a 2000 Chevy blazer that doesn't start up first thing in the morning or first start of the day. After started I can start it all day long. I have repalced the fuel pump already. I can't get it to start now. I can't hear the fuel pump come on when I try to start it until after the key is turned off.
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Many possible causes....Too little info to make an intelligent suggestion. Try charging the problem vehicle's battery with jumper cables for 2 minutes with the supply vehicle running at fast idle (or about 1500-2000 RPM, if it is tachometer equipped) before you try to crank the problem vehicle on a cold morning. If it starts right up, you likely have a weak battery that needs replacing.
Try giving it a shot of starting fluid. You don't say if it's actually firing. If it tries or runs for a few seconds off of the starting fluid then try changing the fuel pump relay. It's inside of the glove box on the left hand side behind the little door. If that doesn't work it's most likely the fuel pump.
You might find this Interesting. go to Edmonds.com and check out the Recalls and Complaints + Service Bulletins for that Blazer. I got lucky and was able to get rid of mine before a lot of it started But, I went through a LOT with it before that!