Carburetors with vacuum lines are still found on classic vehicles and small-displacement engines — but what is the vacuum actually used for? Let's take a look.

FIGURE 1—Here's the relationship between air flow through a venturi and how atmospheric pressure "pushes" fuel into the air stream. At the vena contracta, actual pressure is at a minimum (maximum flow ...

The carburetor became too old school and inefficient compared to fuel injection systems. This was the last vehicle in ...