Which component provides the high-pressure fuel for vaporization?

• A. The high-pressure engine driven fuel pump.
• B. The low-pressure pump.
• C. The FCU.
• D. The fuel divider.

Answer: (A)

High-pressure fuel is needed to atomize and vaporize the fuel for proper combustion, so the system relies on a pump that can raise fuel to the levels required by the injectors. In this setup, that pressure is generated by the engine-driven high-pressure fuel pump. Fuel from the tanks is first boosted, then the high-pressure pump elevates it to the level the fuel control unit uses to meter and deliver to the injectors. The fuel control unit meters the flow, while the fuel divider distributes the high-pressure fuel to each cylinder. The low-pressure pump provides initial pressure, but it’s the high-pressure engine-driven pump that actually supplies the pressure needed for vaporization.