Which system is primarily used in compression engines for fuel delivery?

In compression engines, particularly those found in modern vehicles, fuel delivery is primarily achieved through fuel injection systems. Fuel injection involves introducing fuel directly into the combustion chamber or intake manifold under high pressure, allowing for precise control over the air-fuel mixture. This method offers several advantages over traditional fuel delivery systems, including improved fuel efficiency, better performance, reduced emissions, and enhanced engine responsiveness.

Fuel injection systems can vary, with options like multi-point fuel injection and direct injection being common. Direct injection, while a specific type of fuel injection that injects fuel directly into the combustion chamber, does not encompass all compression engines' fuel delivery mechanisms. Therefore, fuel injection is viewed as the broader category that includes various specialized methods, like direct injection.

The other systems mentioned, such as carburetors and mechanical pumps, are generally associated with older engine technologies. Carburetors mix air and fuel in specific ratios before delivering them to the combustion chamber, which is less efficient than modern fuel injection systems. Mechanical pumps, while they can deliver fuel to the carburetor or fuel injection system, do not represent the primary method of fuel delivery in compression engines today. Thus, fuel injection stands out as the predominant and most effective system for fuel delivery in these types of engines.