1997 Chevy Blazer my 97 Blazer will not start

Check the fuel pump. With the radio and heater off turn the key from off to right before you crank it, you should be able to hear the fuel pump humm if its working at all. Its also possible that its working but just not well enough, you can check to see if there's pressure by following the fuel rail under the hood. There is a valve(looks like the top of a valve stem) on the rail, you can hook a pressure tester to this and test it. If you don't have a tester you can use your key and press the tab down to see if gas comes out. BEWARE. If it is working right with the key on I believe there is 40 to 60lbs of pressure which will make the gas come squirting out so watch out so you do not get sprayed in the face. Two other things you could do is try tapping on the fuel tank by the fuel pump(this sometimes will get it to work a couple more times) and maybe a fuel filter in cased its plugged which would stop it from running