I found a defective primer hose was the cause of a no start condition on a Briggs and Stratton 305 CC 13.5 ft lb side outlet engine on a Craftsman snow blower. The same engine was also used on some pressure washers.
The primer sends a jet of air to the carburetor to produce a venturi effect which draws fuel from the carburetor bowl into the throat of the carb. There is also a manually controlled choke present. It turned out the rubber hose deteriated and was holed-through and the bellow couldn’t produce enough of a puff of air to move fuel from the bowl. Also, the hole probably caused a lean condition and kept the engine from running. A new chunk of hose fixed the situation. Here are a few shots, showing the new yellow hose. On the snow blower version there is no paper filter, just a “ fly screen” type of cleaner. There wouldn’t be much dust expected after a deep snowfall. Enjoy.
The primer sends a jet of air to the carburetor to produce a venturi effect which draws fuel from the carburetor bowl into the throat of the carb. There is also a manually controlled choke present. It turned out the rubber hose deteriated and was holed-through and the bellow couldn’t produce enough of a puff of air to move fuel from the bowl. Also, the hole probably caused a lean condition and kept the engine from running. A new chunk of hose fixed the situation. Here are a few shots, showing the new yellow hose. On the snow blower version there is no paper filter, just a “ fly screen” type of cleaner. There wouldn’t be much dust expected after a deep snowfall. Enjoy.
