How do I fix a 1999 Chevy Blazer to get it running?

Question edited for clarity and fix typo.
Question moved to model category.

'Cranking' is purely the engine turning over. It cranks, almost starts and then it does nothing next time you turn the key? Flat battery.

Or, you turn the key, it cranks, fires and almost starts and then dies? More reasons for that scenario. Check for diagnostic trouble codes. Did you disconnect the battery when you replaced the fuel pump? Did it work after that? Does it have an engine immobilizer and did you reset it after the disconnect?

https://www.google.com/search?q=1999+Chevy+Blazer+crank+no+start

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if it just shuts off, try the auto shutoff relay box..it may be loosing connection with the rest of the harness..

Black smoke is usually extra fuel, but you say you are priming it to start so that could be why.
Have you checked fuel pump pressure before and after cranking ?

POPING IS A IGNITION PROBLEM (MAY BE VALVE)? BUT IT WAS RUNNING. CORRECT..NOW FIX THE FUEL PROBLEM AND DO A MAJOR TUNE UP.. CAP/ROTOR/WIRES/AND PLUGS. GET IT RUNNIG FIRST DO NOT COMPLICATE IT

are you using the same key you always do ? the key is the problem usually .. these are a pain in the **** .the key is a chip key matched up to your ignition .. . you might have to take it to a dealer to get this repaired right .. not just something you can quick fix usually .. thanks Jerry and holler if you need more.

it sounds like your alternator quit charging and then your battery died. do you have a battery charger? if so, charge the battery and try to start it. If it starts but the charging light is on, you likely need an alternator. Most auto parts stores can test it for you.

THE FUEL PUMP IS BAD.

if your losing fuel pressure after the pump runs the drain back valve in the pump has failed.

and i doubt that you are seeing enough fuel pressure to run a vortec engine.

low fuel pressure equals a non running vortec

same just happend 2 me,was told it was the neutral safety switch -but didnt start in neutral-took 2 shop 400 later it was the ignition switch runs great again hope i helped

fuel filter is acheap part ur car needs and it cause the same, or coil can go out slowly. take it parts stare to have it checked good luk claymister

First of all make sure all your battery connections are Clean and Tight. If they are and all your dash lights come on and its not starting But its cranking over Your anti theft alarm may have gotten activated. You may have to leave your Key in the On position for 20 minutes to reset the alarm. Not cranking just in the on position, Now if its not Cranking and your hearing a clicking sound it may be your starter. I have sometimes tapped on the stater with a deadblow hammer and had someone crank it over Making sure your in park foot on brake and being EXTREMLY Carefull that you are not going to run someone over. If that don't get you going Get back to me we can do some more trouble shooting. Get that thing going for you. Thanks, Bear001