2001 Chevy Cavalier

If you are really quite, and turn the ignition key to "on" but not start, you should be able hear the fuel pump buzzing, for two or three seconds. If no noise, bad. If noise doesn't stop, bad.

Start there.

My usual advice is , "take it to the man".

Cold be all the things you suggest, and more.

Test, test, test.

I hear the fuel pump and have tested it. I have disconnected at fuel filter turned key to on and it pumped fuel out.

Then it's a "no spark" fault.

Not a "no spark' fault. -OP "When I pour gas into the throttle box it will start and run til there is no more fuel"

More likely something inhibiting fuel from being sprayed out of the injectors. Could be fuel line or filter clog, corrosion on injector connectors on ECU or sensor, bad pressure sensor or throttle position sensor, etc.

OP, if you are serious about fixing it yourself, I suggest you get a Haynes or Chiltons repair manual. It will also be advantageous to purchase or borrow a code reader to see if there are any error messages.

If you have not put a pressure guage on the line in to the throttle body you may not have enough pressure to over come the regulator but an open line will spue quite a large amount of fuel unrestricted.

What is the fuel pressure? Without reading the fuel pressure, you, and we, are just guessing, so just throw parts at it. -- JHF

Here is the information you need to check the pump correctly to eliminate or confirm the pump operation before you waste money on other parts. troubleshoot from the source to the destination one part at a time. Again the pump could be pumping a lot of volume but if there is no pressure then "NO GOOD".

• Open the hood of the Cavalier, and locate the fuel rail on the top rear portion of the engine. The fuel rail is the metal tube that connects to all four fuel injectors. Remove the cap from the protruding nipple on the top of the fuel rail. This protrusion is called the fuel pressure tester port, and is used to help diagnose fuel delivery problems. Install a fuel pressure tester hose onto the tester port and snug the tester onto the port.
• 2 Ask an assistant or second person to turn the engine on. If the engine will not run, ask your assistant to turn the engine over as if trying to start it, but for no longer than three seconds at a time. Read the fuel pressure tester dial during the engine run cycle, or the engine turning over. The dial should indicate a reading between 44 to 54 p.s.i., or pounds per square inch. If the dial does not indicate this level when the engine is running, or sporadically during engine turn over, then there is a fuel deliver problem.
  
  Read more: How to Check My 2001 Cavalier Fuel Pump | eHow.com http://www.ehow.com/how_7813566_check-2001-cavalier-fuel-pump.html#ixzz2DX2UySo3

I agree with all you say. My reason for not elaborating is the safety issue. If the OP has no more experience and/or knowledge of these systems, I would be very concerned with trying to give instructions for such a dangerous test in a forum like this. My late sister-in-law, who was a VERY experienced head nurse talked about ALL men pouring gas into a carburetor and looking into it just as it backfires and getting seriously burned. I don't do that, but her years in the ER pointed out the danger. That was on lower pressure fuel systems. With the pressures we are dealing with on a FI car, and next to an ignition source, that scares me. He/she needs to buy a good book, as another poster said. -- JHF

I agree pouring fuel into a fuel system during the cranking or the actual running is NEVER a good idea. That is why you attach the gauge stand away and have someone in the car crank it over, read the gauge(He has already indicated that it won't start and there is no need to start it with this method), then determine the next course of action. I would hope that in this process all safety precautions are considered and followed. Gasoline handled carelessly or improperly is extremely dangerous. Also this information has a link where I found it if there is is a need for further troubleshooting. But please Be carefull and don't take any chances "BE SAFE"!

You are well on the way to solving your problem, you know that it is a fuel problem, the fuel is not getting to the engine. work your way along the fuel line to see where it stops.

alternatively, 2001 I would expect to be be fuel injected,

1. the manifold feeding the injectors will have a fuel pressure regulator. if it has died it could be allowing all the fuel to recirculate straight back to the tank, ie no fuel pressure at the injectors, or

2. the injectors are not being pulsed by the injection system to open them - a blown fuse or broken wire could stop the signal....

Check the fuel relay to make sure the pump is getting power. If getting power check the fuel pressure regulator as was suggested.

Have you checked for trouble codes? The signal to the injectors could have been disrupted, giving the same results, if the fuel pressure is good.

Not yet, I will try. Did not know any codes would appear with fuel problems. Thought that was all for electronic signals. Thank you

Not in the fuel pump or pressure regulator at this stage of evolution, but the injector pulse is from the computer, and as such can be monitored.