I had a similar problem with my deere d140. It would starve for fuel after running for a while. I changed everything and that did not help. Carried to a national dealer, they changed carburetor ($500), did not help, and wanted to change manifold ($600). I told them to put my old carb back on, and I will pick it up.Hi Gang, Hoping somebody might have run across this problem: My Craftsman tractor has a Briggs & Stratton "Platinum" 540 cc, 21 hp engine. It runs great with a full tank, but stalls out as the fuel level approaches 1/2. I thought it was a fuel line or filter issue, so replaced filters and replaced lines and didn't help. This problem is two seasons old now, just filling the tank is an ok work around, but thought I might try to fix it this summer.
I'm thinking it might be a dirty carb issue, but not sure why the 1/2 tank vs full tank would matter, unless a full tank supplies more pressure to push fuel through??? Not sure if that is even possible.
Before I spend the time take apart the mower to get to the carburetor, I was hoping someone could confirm that it is likely a carburetor problem. If it is, should I replace carb or just clean it? (10 years old tractor).
Thnx!
I got it home and looked at everything I could , and did not find anything.
Finally I removed the gas tank, and Inside I find a PVC Pipe fitting, A brass Slug about the size of a quarter, and a brass ring like a key ring only bigger.
With the sleeve that is in the filler port of the tank, I was unable to get these items out of the tank, so I removed the intake from tank that feeds the engine. This intake is just a straight pipe with an open end that sits about 1/8" above the bottom of the tank.
The slug in the tank about the size of a quarter was getting suck up to the bottom of the intake pipe by the vacuum from the engine causing it to starve for fuel.
Solution: I cut 4 small "V" shapes in the bottom of the inlet pipe and and reinstalled it in the tank and reinstalled the tank in the mower, the foreign objects are still in the tank, but the engine has not stalled for lack of fuel since.
Not sure this is your problem, but it fixed mine. good luck