A valve system of a V-type engine in which a camshaft provided in each bank is formed with valve cams that open and close engine valves and a pump cam for driving a fuel pump, the phase of the pump cam relative to the valve cams is set such that the crank angle at which driving torque of the pump cam is maximized does not coincide with the crank angle at which driving torque of each of the valve cams is maximized.