24 hp briggs engine quit running, will start on ether briefly, good fuel flow past filter, dont see fuel coming from pump. Fuel pump or anti idling valve?

This sounds likely a badly routed fuel line that is getting hot and causing airlocks. The fuel delivery is slow, the gas heats up and vaporizes causing an air lock. You can test by removing the fuel line and with no engine running, run the contents of the fuel tank into a container. Do you have good fuel flow?

Or the float bowl isn't venting via its overflow pipe.

blow air back threw the line towards the tank you have something clogging it or you forgot to turn the fuel on

time to pull the hose off the fuel pump coming from the tank and drain the tank and check flow of gas coming from tank hose, and possibly inline fuel filter is plugged or there is junk in your tank/line from tank not letting enough fuel to run to pump so pump can pump it to carb !

Running for 1/2 minute then stopping sounds like the carb's fuel bowl is starving for fuel. I would check the carb's float and needle and seat to verify it is not sticking. Usually when the engine runs there is enough vibration to unstick it. I would also look at fuel filter (disconnect the fuel line to the carb and verify that fuel flows freely - try not to spill too much).

Gas is so poorly refined these days, Youll notice the fuel stabilizer says it is only good for about 30 days. although i cant give specific instructions on how to clean out the clogged jet in your carb, if it runs on starting fluid, a clogged jet is deffinately your problem. start with the float bowl make sure it has clean fuel in it and the primary jet is usually in the bolt that holds the bowl on make sure its clean and if the float hanging down opens the needle valve and fuel flows your good to that point. if the engine still wont run, or only runs with the choke on. get some carb cleaner spray and go at it, make sure you can blow through every port and jet, BUT WATCH YOUR EYES you never know where that stuff is going to exit.

next year winterize it, drain the fuel and run it till it dies.
or i like to winterize my engines by replacing the regular fuel with a little bit of aviation fuel as that stuff can sit for years, just dont operate or mow for more than 2 or 3 minutes on it.

Good luck

How long does it run before it quits?

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There is a restriction somwhere before the fuel filter, this is assuming gravity feed and there is no fuel pump for the engine.

It sounds like the float is sticking in the carb. Since the carb is higher than the fuel tank it pulls the fuel in by vaccum of the engine. when running at high rpms, it can burn the fuel thats flowing into the carb, when you idle down, the bowl of the carb is filling up with fuel faster than the engine can burn it and causing it to flood. Then when it shuts off at idle it does not want to start back up because it is flooded. To make a long stary short, pull the carb and give it a good cleaning and your problems should be solved.

This same thing happens to me and I resolve it by taking the gas line off in front of the carb and blowing air through it.....then it will run fine. I realized I could do this when I took the air cleaner off and fed it gas manually and it ran fine....and I also had gas pumping through the fuel pump. I'm not sure of the problem....either the fuel pump is losing power or their is something blocking the carburator intermitantly

your fuel pump is diaghram actuated by pulses from crankcase pressure, if you look there is a small tube that runs from pump to valve cover, pull fuel line off carb and have some one crank it over to see if it's pumping. could be pump or blockage between tank and pump, if fuel flow seems good to carb, i would pull bowl off and check for dirt and also make sure anti run on valve, the thinghy that holds the bowl on to carb is opening properly, it should open and close when you turn key from off to run, beyond that it could be you have some water in your gas.