Try taking the air filter off and spraying some starting fluid in the carburator. This should start the engine for a short period and pull the gas from the tank. I suspect you have an air lock in the line. you could also take the line off the carburator and let the gas flow out.
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Maybe when the ignition coil heats up it will not produce any spark to the spark plug. Run the engine until it stalls and remove the spark plug and put the plug wire back on and ground the plug to the engine. See if you get spark at the electrode of the spark plug when you have some one pull the starter rope with the switch on the run position.
if it is the float bowl drain leaking, close the drain. If it is the vent, clean float bowl and needle and check level. Next time, drain the fuel out of float bowl after you run it if not planning to run it for 30+ days. That is why they put drains on generator carbs. Modern ethanol turns to gum real quick. Tell you congressman you think ethanol sucks and the new 15% ethanol the farm lobby is trying foist off on us is going to be a disaster for small engine owners.
There is debri or dirt in gas tank and eventually it gets sucked up and clogs the screen filter on the end of gas line. Drain gas tank and flush out a few times. let dry and put new gas in it. check your gas can, if it is metal, it may have rust in the bottom of it and it goes in the gas tank and clogs screen, make sure you have a clean gas can that you use to fill the generator.
Most likely it is some sort of gunk in the carburetor. if it has been stored with gas in it this can cause this problem. You can try a strong dose of carburetor cleaner in with the gas. (Use fresh gas in the tank). and see if that helps. give it some time, but It may need a new carb or a rebuild.
You can disconnect the fuel line from the carb and drain the gas. It would be even better to then remove the fuel tank. If this is the generator with the large plastic tank, quite often the rubber gromet in the bottom of the tank with shout off vavle in it will deteriorate into a black gooey mess, and leak. If so that will have to be replaced. Clean inside of tank with fresh gasoline. Remove bowl from carburator and clean throughly. If you know how to work on engines, remove the carburator and clean throughly, notice how all springs and linkage were connected before removeal. Be sure all passage ways in carb are clean. Always use sta-bill in your gas.
The needle valve may be stuck which would not let gas into the carb. I don;t think rebuild kits are too expensive. Pull the carb and take it to a lawnmower repair shop and they should have the parts. Before that though pull the bowl and make sure it has gas in it. If no then remove the fuel line and make sure gas flows from it. If no then could be the fuel shutoff valve is not operating properly or junk in the gas tank is obstructing the line.
Drain all the gas/oil mix out of the system. Press the red prime bulb several times until there is no fluid in the line. Pull the spark plug and clean it with a soft dry rag. Reassemble and fill tank with 2 cyl/gas mix. Prime it, then pull several times on the start cord. That should work.