My Parents gave me a Craftsman Yard Vac (Model No. 247.770550) that they hadn't used in a few years. The tank had been empty, but mice had made a nest around the engine. I chased the mice away and fueled up and it worked fine. I cleaned it up for winter, removed a few dead mice and their nest, put some sta-bil in the tank and ran the engine for 10 min. This fall it would not start, I replaced the spark plug, air filter, oil and gasoline (this time with TruFuel). I also took off the housing and cleaned out the rest of the mouse nest. Still no luck. I then decided to clean out the carburetor, it was pretty dirty. I replaced the pin & seat, bowl gasket, and the sealing washer and cleaned everything with carb spray, a paper clip, and a toothbrush.
The Vac now starts but will only run with the choke fully on, and will die after ~2 minutes.
I'll add that after reassembling i had gas leaking all around the carb, i tightened the main jet bolt and it stopped. Also, after using the vac for a little while i had another gas leak out the carb where the air filter hole is (this was after it sat for 5 min), but this stopped quickly.