Fuel pump could be shot. The reason it will run after it has burned all the fuel that has been dumped into it, could possibly be caused by vacuum; as the engine is running the throttle body is actually pulling fuel from the tank, through the fuel line, through the fuel filter and dumping it into the engine. This is BAD, your throttle body was not designed for this. Check your fuel pump. (usually if you turn your key on but don't start the car you can hear the fuel pump prime the engine)
You say it runs when gas is poured in the engine but not with the key start. Two questions: (1) where in the engine are you pouring gas, and (2) how are you starting the engine if not with the key? If you mean you are pouring gas in the carburetor or in the spark plug hole and it starts with the key, but doesn't start if you don't pour gas in, the needle valve on the carburetor may be closed or the float may be stuck in the closed positiotion. You might also want to check the throttle linkage.
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