Does my 2004 cavalier have a fuel kill switch

This usually happens if you have a clogged fuel filter. It will cause the pump to work harder an burn out. How low to you let the gas get?

You must scan the system with a code reader.

did your car come equipped with prolock? prolock starter kill can become defective and prevent your car from starting. or it can be your ignition switch. I had a defective ignition switch and the van 's fuel pump would turn on but no start...

Aftermarket Stereo installed wrong?

Disconnect that & see what happens

If a fuse blows- you found the circuit with
the fault,so why has'nt that part of the problem
been resolved

Definitley NOT an O2 sensor(they don't even do anything for the startup).What happens if you shoot some starting fluid in it?

Have a look at this: http://www.gminsidenews.com/forums/f53/04-cavalier-fuel-pump-relay-60801/#post1317597 It seems to be your problem.

Is it getting fuel? Have you tested the fuel pressure? You may have a faulty fuel pump or fuel pump relay. Can you hear your fuel pump buzzing. Remove your gas cap and have someone turn the key to the run position while you have your ear near the open gas tank. You should hear the pump making a buzz. If you don't hear anything you have a bad fuel pump or problem in the electrical circuit to the pump. If you do hear it running you still need to check the pressure. If the pump is buzzing it still may not be working correctly. You could try giving it a shot of starting fluid and if it runs on the starting fluid you know you have a fuel related problem. Be careful with the starting fluid because it is very flamable.

your vehicle does not have a fuel pump kill switch.

When you turn the key, you should hear the fuel pump make a whiring noise as it dispenses the fuel. If there is no noise. the fuel pump is not working.

Have you checked the fuel shutoff inertia switch.?
Check your owners manual for location.

this could be your fuel pump on its way out.