probably needs the car rebuilt
Disconnect the fuel lines and use berrymans spray to clean the pit cock.
The correct ratio for that particular snowblower engine is 50 parts fuel to 1 part two-stroke engine oil.
32:1
Adjust the fuel/air mixture, ensure you have an unclogged air filter/air cleaner.
50:1
50 to 1 (parts)
be best to drain fuel and replace with correct mixture
Be sure the vent in the fuel cap is working.
Possible causes: faulty spark plug; dirty or clogged fuel filter; dirty or clogged air filter; carburetor needs adjustment.
No fuel in tank; clogged line at/in the fuel tank; clogged fuel filter; carburetor needle valve is closed, fuel float stuck closed. Disconnect fuel line at carb, if you have fuel there, the problem is at the needle valve or float; if no fuel. the problem liies between the carb and the tank, next methodical check would be the fuel filter, etc.
Need a bit more info, there are (2) main areas, FUEL & IGNITION. How long will it run for? What action makes it stop ? Nine times out of 10, there is a fuel problem with the carburetor.
fuel line has leak or fuel filter needs to be replaced