An overabundance of fuel in the engine cylinders, preventing proper combustion, is a condition commonly referred to as an engine flooding. This typically occurs during starting attempts, especially in older vehicles or those with carburetors, where excessive fuel is delivered into the cylinders. This excessive fuel disrupts the air-fuel ratio required for ignition, rendering the engine unable to start. An example is repeatedly pumping the accelerator pedal before starting an older carbureted car, a behavior that can easily lead to this fuel overload.
Addressing this condition is critical to avoid potential damage to the engine, such as cylinder washdown, where the excess fuel washes away the lubricating oil from the cylinder walls, leading to increased wear. Understanding the causes and remedies can prevent extended periods of immobility and costly repairs. Historically, dealing with this situation was a frequent issue, particularly before the advent of modern fuel injection systems that precisely control fuel delivery.
