Craftsman LT 1000 w/Briggs & Stratton Stalls after 20 minutes.

Ok, I have a Craftsman LT 1000 riding mower with a 42 inch deck. It has a Briggs & Stratton 17.5 HP OHV AVS with model number 31C707 and type number 0230E1. The issue I am having is that it will start fine and then after about 20 minutes it will stall. It will start immediately after and run for another minute or so and then stall again. After letting it cool of for 20 or 30 minutes the same process will repeat.

Now, what I've done so far. I have changed the air filter, fuel filter, solenoid, spark plug, fuel lines, and armature-magneto. Further I have drained all of the gas in the mower and replaced it with fresh as well as changing the oil and verifying the correct oil levels. I have cleaned the carburetor and verified that fuel was reaching the bowl and that the float is in good condition. I have also treated this motor with Sea Foam.

So now I am basically at a loss of what to do at this point. I have tried everything I know to do. When the mower runs it sounds great. It does not rev up and then die it just dies. So any help or suggestions are appreciated.

Thank You!!

 

Try loosening the gas cap and see if takes care of the problem. If it does get a new cap.

If the vent in the cap is not working the engine will draw a vacuum in the tank until it cannot draw fuel and the engine dies. Sitting without running allows time for air to seep back into the tank so it can draw fuel again and run.

 

I just tried that with no success. Thanks for the reply!

 

Take the float bowl off and observe the flow of fuel into the bowl. It should run a steady stream, not a dribble. If it's a dribble, check the fuel line flow. It may have a collapsed fuel line or something lodged in the inlet of the carb.

 

Hello, thanks for the reply. Today I went out and just overhauled the carburetor everything works fine with the exception of a small ridge in the mixture screw. I went ahead and used the same mixture screw cleaned everything with carburetor cleaner and ensured everything was working correctly. When I got done I started it up and it ran great. I mowed for about 45 minutes then shut it off. I ate supper came back out and mowed for another thirty minutes or so and then it stalled again. I also followed your direction and verified there was a stream of fuel to the bowl and not a drip as well as adjusting the idle speed.

 

Can you see down in the bottom of the gas tank? Sometimes a foreign object gets in there and randomly blocks the fuel outlet.

 

Thank you for the replies! This is actually a little embarrassing. It must have just been something in the carburetor. Yesterday evening after it quit I was so frustrated I just quit for the day. This morning I went out to check the gas tank for something in the tank and realized I had run out of gas haha... I was so glad to have it running yesterday that after it did I neglected to fill the gas up. It had just been stalling on me so much and I had repeatedly checked the fuel it just slipped my mind. So, I fixed it. Thanks for your help.