Which term describes a fuel delivery method that operates at low pressure before the fuel enters the engine?

• A. Low pressure injection system
• B. High pressure injection system
• C. Direct injection system
• D. Carburetor system

Answer: (A)

The key idea is how and where the fuel is delivered relative to the intake air. A low pressure injection system delivers fuel at modest pressure to a centralized point or to the intake side and then injects it into the intake path before the air-fuel mixture enters the cylinders. This method relies on the air flow to help atomize and mix the fuel, rather than forcing it directly into the combustion chamber.

This is different from high pressure injection, which pushes fuel at much higher pressure directly into the cylinder, and from a direct injection system, which injects fuel straight into the combustion chamber under high pressure. A carburetor system, on the other hand, uses a venturi to meter fuel without electronic injection. So the description fits a low pressure injection system.