When new vehicles are being developed and will later be made available to the market, one of the most important characteristics that may influence the buying decision is the comfort available to the driver and passenger inside the vehicle. This comfort is partially limited by NVH issues inside the car for example. With the new technologies development, vehicles have become noiseless and, that’s why some vibrations from fuel supply module that weren't identifiable then now might show themselves a huge impact of noise inside the vehicles. So it is important to analyze the NVH behavior of fuel supply modules. To perform this study in a short time and with low cost, CAE simulations were done focusing on geometry optimization of the pump holder that keeps the electric fuel pump inside the fuel tank.The objective of this paper is to develop a stiffness calculation tool of complex structures to reduce the radial / tangential vibrations of the fuel pump using mechanical tests, CAD, CAE and design of experiments.