As long as I put gas in the caburater it will run but will not run on its own

It's sucked the oil up the breather tube. Something maybe blocked where the air has to enter the engine.

Don't put the nozzle all the way in, and try leaving ur car running. If u leave it running turn it off.

try some fuel injector cleaner or replace fuel injectors or fuel filter

What engine size?

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It wouldn't hurt to change the filter, but it sounds like you got a bad batch of gas, if it was running good before you got gas.
Get a bottle of dry gas and put it in the tank, if there is any water in the gas, that will clear it out, also it wouldn't hurt to put a bottle of fuel injector cleaner in the tank, I use that stuff all the time to keep the fuel system clean.

Sounds like water in fuel tank. Try putting some gasline antifreeze in, (maybe a couple of bottles) will clear up water and problem if that's it.

bad throttle body or injector,

after you put gas in it did you prime the system?

when the gas runs out it drains the fuel lines, so after you put gas in the tank you will need to prime the system. To do this turn the key on to run but don't crank the starter and count to three, then key off and out. Do that three to four times and that should take care of getting gas to the engine.

Make sure you can hear the fuel pump turn on when you turn the key on. Sometimes when you run low on gas it can overheat the fuel pump causing it to fail.

Fuel filter blocked or lack of fuel pressure could be the problem.