So I bought my blazer and said it needed fuel pump. Replaced that after fix tried to start it would turn over then when I realese the key from on position it would putt exaust out of intake. Let it sit for one week truck started fine worked for two weeks with no problems then happened again.read online that if you put a security by pass in or a remote start it would do the trick. Did that no luck truck still no start . Any idea or help having no car is terrible

 

Ignition switch? Do all the warning lights come on(bulb test) when you turn the ignition to the ON position?