Farshid Jafari Harandi wrote:
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Hi steve ,

you are right but the tank is not always full and thus most of the time there would be some air on top of the fuel and this will make a air-fuel mix .


No, the vapour pressure of gasoline is so high it expels air from the tank- gasoline is very, very volatile. This is not a theoretical concept - look at real fuel senders on real cars ! I remember being about 11 years old and noticing this when my dad and I were working on our family car- this was his explanation of why we don't all go "boom"

Steve