In this paper, simulation of the step response of electro hydromechanically controlled constant power regulated swash plate axial piston pumps with conical cylinder blocks has been carried out when a new fuzzy logic controller (FLC) is proposed to replace the PD controller in current use. The theoretically deduced performance shows that the proposed FLC renders better performance when compared to both the PD controller and a previously proposed FLC. The effects of the control valve supply pressure, valve port width, and control piston leakage coefficient on the pump step response has been investigated. Results show that the proposed FLC renders better dynamic performance, when compared with the previously proposed FLC and the PD controller, at all practical values of the investigated three parameters.