Briggs&Stratton 140cc will not start

[Tim57107]

So far i have replaced the carburetor, ensured rubber hose from gas tank to carburetor is clear and clean. I also cleaned out fuel tank and added new premium gas, changed oil, replaced spark plug. It is getting spark. The only way to get the mower to run is spray starting fluid directly into the carburetor with air cleaner removed. It runs for 2-3 seconds. Cannot get it to keep running. The carb bowl is full of new clean gas. Please advise what else to do to get it running and keep running.

 

[ILENGINE]

It would really help if we had the model, type, and code from the engine so we could see what your engine looks like. A 140cc engine narrows our options down to a few hundred variants.

 

[slomo]

Gas cap vent for $200.00 Alex.

 

[StarTech]

And without know the setup [engine numbers] we can only guess but it likely a clogged fuel bowl nut/bolt as many have carburetors that use this nut as a jet.