Abstract: A pump apparatus may include an inner rotor, a driving shaft, a curved surface formed at an inner circumference portion of the inner rotor into which the driving shaft may be inserted, the curved surface being formed by a plurality of curves along a rotation direction of the driving shaft, and a pressing body slidably engaged in the driving shaft and elastically pressed in a radial direction of the driving shaft by the plurality of curves.

Abstract: A fuel injecting control method during coasting of a vehicle, may include operating coasting mode when a coasting mode operation condition is satisfied, maintaining the coasting mode for a predetermined interval, injecting fuel according to engine speed, cutting fuel injecting when detected vehicle speed is equal to or more than a predetermined fuel cutting vehicle speed and less than a predetermined vehicle over speed, operating an assist brake when the detected vehicle speed is equal to or more than the predetermined vehicle over speed, and releasing the coasting mode when a releasing condition of the coasting mode is satisfied.