Two fuel-related issues can lead to stalling in a gas snow blower. The first is a low fuel level in the gas receptacle, which can prevent the engine from running smoothly. Another fuel-related issue that can cause stalling has to do with improper fuel tank venting. To combat this, simply remove the gas cap and then replace it, thus dissipating fuel vapors.
While some gas snow blowers stall due to mechanical issues, stalling can also be caused by user error. Particularly with single-stage blowers, pushing the device into overly large snow piles can lead to stalling out. You should tackle small piles, allowing the blower to slowly bite into the drifts. For deep drifts, push toward the drift slightly, then pull back, allowing the pile to cave in on itself and fall, and then blow that fallen snow.
If the choke lever is left in the "ON" position, the engine will continue to stall out. Changing the setting from "ON" to "OFF" will remedy this common cause of snow blower stall-outs.
The snow blower's gas engine can also stall out when the auger clutch lever is left on. There are three things that can trigger this. A foriegn object like a branch or rock could get wedged next to auger clutch lever in the on position, or the snow kicked up by the blower can cake up on the chute and block it. In very cold weather, the auger itself can also freeze.