LX 280 dies while mowing

[popeye14]

I have a JD LX280 mower. It will run about 20-30 min and then just die. We have changed the fuel pump, the carb needle, the spark plug, gas cap and the battery. I have a large amount to mow and can't even get it to start now. Any ideas? This has been going on since last summer, we started out by changing the battery and fuel pump. Then this summer it continued to do the same thing, so I ordered a new gas cap. Still had the same problem. My dad came over and looked at it for me, he thought the carb needle might be sticking so he showed me how to take the bowl off the carburetor and check the needle and kinda flick the "white round" thing (sorry I don't know what it is called) to make sure the needle wasn't stuck. I would also blow on the fuel lines when I did this as well. Whenever, I would do this routine it would run for about an hour and then die. So I ordered a carb kit and we replace the needle only. It still dies and will not run. I have taken the hose off the back side of the fuel pump and when I try to start it the gas flows through the pump fine.

I am at my wits end trying to get this mower to run. Any ideas would be greatly appreciated!

 

[BATTY54]

Try the solenoid in the carb you may have had a few problems and only hit one with your first round of repairs.

There is a solenoid that cuts fuel off to the carb to prevent backfires when the ignition is turned off.
A simple check would be to spray some fuel or starting fluid into the carb while cranking see if it wants to run.