Where does the pressure injection carburetor obtain its fuel pressure?

• A. From gravity feed reservoir
• B. From an electric pump mounted in the tank
• C. From an engine-driven fuel pump
• D. From atmospheric pressure in the intake

Answer: (C)

Pressure injection carburetors get their fuel pressure from an engine-driven fuel pump. This pump, driven by the engine, creates the constant pressure needed for metering and for injecting fuel into the airstream. Gravity feed wouldn’t provide a reliable, positive pressure, and an electric pump in the tank isn’t how this system is typically powered. Atmospheric pressure in the intake can’t push fuel into the carburetor at the required rate or pressure, so a dedicated engine-driven pump is essential.