i have an idea to test your theory. sticking needle!.the float , floats up and stops the flow of fuel by pushing needle into hole. if you loosen jet screw and rotate the primer cap so that the float cant float all the way to the top and push needle in.then your fuel will flow constantly. it may leak out of the primer bulb a bit but at least you will have constant fuel supply and test to see if mower runs for more than a few minutes.

If my collection is complete ( then how come i keep buying stuff ? ) 🤔🤔🤔🤔🤔