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Different types of vane pumps include rolling vane, sliding vane, flexible vane, and swinging vane. The vanes close the small amount of fuel as the rotor moves, and release the fuel once it crosses the outlet valve. Because it is off-center, it creates a crescent-shaped pocket of space that lets the fuel in. Inside a rotary vane pump, a rotor with “paddles” operates off-center within a cavity.