Most likely the anti-after fire fuel solenoid or possibly the ignition module. You can remove the plunger from the solenoid and run. If problem goes away then its fuel solenoid related.
Try changing coil.when it dies on you see if its hot,it should be warm but not hot.if that's not it then spray starter fluid in it and see if it stays running.if so its carb or fuel delivery problem.hope this helps...................leadfoot44
SOURCE: New MasterCut mower runs erratic & gasoline leak around fuel cap.
as it is a new machine if it has not been p.d.id by dealer it may be that some test fuel residue is in carburettor which is causing this,you need do drain of carburettor of all fuel,remove bowl and spray clean useing either air or carb cleaner spray(should get from local autoparts store) note try to spray up centre of carb as may be a jet up there as well,refitt bowl and make sure you use fresh fuel this should solve problem,with unstable running fuel may be finding a way back through breather at carb with the vibration and may be cured after you have done carb
SOURCE: craftsman riding lawnmower shuts off after 15 - 20 mins.
I have a Troy-Bilt push mower that does the same.
Try this - Run the mower until the point of quitting. Keep the hood up and be ready to remove the gas cap. As soon as you feel it start to stutter like it's going to quit, unscrew the gas cap and see if it comes back to life and doesn't quit.
If that works, then what is happening is that the gas in the carburetor bowl is getting depleted faster than the tank can provide it, possibly because of a clogged vent that's supposed to allow air back into the gas tank as gas is used.
You can try running with the gas cap not quite tight, to let some air seep in that way, but that's more prone to sloshing leaks. You could also try drilling a hole in the gas cap - about 3/16" is plenty, and stuffing a piece of natural sponge in to keep the gas in and dirt out. Synthetic sponge will deteriorate in gas.
SOURCE: Toro 6.5 hp pushmower shuts off after ~ 5 mins of
It may have a gravity float residing in the carberator which may be cracked and will show same symptoms.If not garvity float, check for loose connection, heat and vibration my cause it to die, it cools and then restarts.
SOURCE: Stalls after 20 mins. of running fine. (Starving for gas)
From the rear of machine look at the top left of fuel tank for the fuel line.Where line comes out of tank see if it is pinched where it goes down between frame and tank,grab line and see if it moves freely.If that is OK loosen fuel cap after 10 minutes of run time to see if your vent hole in cap is working.These are 2 common problems for the L series mowers.
SOURCE: MTD mower runs for 10 minutes then quits.
I have the same problem with mine. I have narrowed it down to a fuel problem through deductive reasoning. Try this test. Start the engine clamp the bar (keep away from the spinning blade) when the engine tries to die push the prime bulb to keep it running. This simulates a fuel pump by putting a pressure higher than atmosphere into the float bowl spraying fuel into the intake. If this is the case the line (on mine it is a black tube) connected to the engine is clogged or what it connects to in the engine is not working properly. I am looking for a diagram of the carb and the engine that is detailed but I have not found one yet.
Please get back to me with your results. Thanks
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