– If carb has air filter/cleaner, it passes through itīefore moving on, here is a real carb kit for V-Twin engines designed by S&S that will hopefully help you apply the above diagram information to a more realistic case. On the other hand, the air has an even simpler path, which is: – At last, gas enters the float bowl of the carb – The fuel line drives the fuel to the fuel filter – The fuel pump inside the gas tank pumps gas when the starter begins Now, looking from right to left in the above figure we have the following two paths for each of the mixture’s elements… Its design is straightforward as you can see in the figure below. Although it is very rarely used in modern vehicles it was the most common type used until the early 90s in both cars and bikes. This is the “old school” type for getting the air/fuel mixture into the combustion chambers. Although, my posts focus mainly on gasoline engines, the below information applies to diesel ones too. That said, you should have some very basic knowledge of this type of engines to understand this blog post. Hello again fellows, in this post I will attempt to provide an overview of the most widely used techniques for fuel management systems in internal combustion engines.