What type of engine-driven fuel pump is widely used other than gear and piston pumps?

• A. Rotary vane pump
• B. Diaphragm pump
• C. Gear pump
• D. Piston pump

Answer: (A)

Rotary vane pumps are a common engine-driven option beyond gear and piston pumps. The pump has a rotor with sliding vanes inside an eccentric housing. As the rotor turns, the vanes sweep against the housing, creating expanding and contracting chambers that draw fuel in through the inlet and push it out through the outlet. This produces a smooth, steady flow with less pulsation than a piston or gear pump, and the design is compact, simple, and reliable. They’re also easy to drive from the engine and can maintain good prime and flow across a range of viscosities, making them well-suited for feeding fuel systems in many engines. This combination of smooth delivery, simplicity, and dependable priming is why rotary vane pumps are widely used when gear and piston pumps aren’t used.