Store-bought bleach is made up of two things: a fairly small amount of chlorine, and a much larger amount of water. Chlorine is a corrosive oxidizer not far removed from oxygen itself on the periodic table, and it causes a kind of forced chemical "burn" in anything that reacts with oxygen. On immediate contact with fuel, it "pre-burns" or oxidizes the fuel before it gets to your engine, rendering it inert to some degree. However, if bleach is going to cause an engine to stall outright, it may be more because of the massive water content than anything else. In this sense, it would have about the same effect as pouring the same amount of water in the tank. But it would take a lot of bleach to cause an engine to stop running outright.