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There is a complicated physics/chemistry answer for this question and a "mechanic" answer. I will give the mechanics answer. I am assuming that you are asking this question in regards to a specific amount or volume of gasoline, because the obvious answer otherwise would be that the fuel is being pumped in the engine at a high rate and an open container is just....sitting there. With a specific amount of gasoline, in a container, the amount of gasoline that can be burned at a given time is in direct relation to the amount of surface liquid in contact with the air. In an internal combustion engine the fuel is mixed with air and atomized thereby creating more surface area to burn. Also the fuel air mixture is compressed, which causes heating and makes the mixture easier to ignite by a spark. Simply put, you cant burn something without air, and you can only burn a certain amount of something with a certain amount of air.

David W.

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