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There is a lot of types of starting fluid. Some is kind of safe....kind of!! Most will destroy your engine!! If you are using starting fluid on a Saturn, you really need to stop. Your fuel pressure could be incorrect. The fuel pump relay could be bad, or a fuse. Your fuel pump may be going out. Listen to your fuel pump when you turn the key to the "run" position before turning the starter over. You shoulh hear a 2 second buzz from the fuel pump. If you don't hear this , you have a fuel pump issue.
I would check fuel pressure before and after you crank the engine. The pump gets power for 3 seconds during startup - if the fuel pressure has leaked down you would have to crank the engine until the oil pressure came up to get the pump to power up again.
You could have a bad pump motor in your fuel pump. You will hear the "hum" of the pump motor but it won't continuously feed enough pressue to the system.
When you prime it the engine will draw enough to run for a bit then quit. They usually dry out if not kept full and sunfire fuel pumps are noted for this type of failure.
Try a used one for about 75 bucks. My kids Sunfire did exactly the same thing.
It sounds like it's not getting fuel. Are you in a cold climate? The gas line could be frozen. You can check the fuel pump by disconnecting the gas line at the carb, you may want to put a length of hose on the line and catch the gas in a coffee can. Then have someone crank the engine while you watch to see if gas squirts out of the line. I wouldn't use too much starting fluid, you can damage your engine, pour a little gas in the carb instead. Also, on a truck of that age the gas line could have a hole rusted in it between the tank and the fuel pump. If that's the case the pump will not pull the gas out of the tank it will draw air instead. It could be the fuel pump itself. If you have a good stream of gas to the carb then the problem is in the carb. It could be the needle valve is stuck shut, take a screwdriver and lightly tap on the carb, that will sometimes jar the needle loose. If you have gas to the carb it could also be clogged jet inside the carb. I you hold the choke partialy closed will it stay running then?
I would check and see if this is your fuel pump. Spray starting fluid in the throttle body right underneath the air horn and if its starts it's your fuel pump. Try turning your key three times but do not start it the first two times and your third time let it cycle for a second then turn the key to start. If it starts during one of these tests it's your fuel pump. Of course check battery and cables, plugs and wires, fuel in the tank, and starter. Autozone offers free tests on your electrical system. I hope this works for you!