The present invention provides a liquid-cooling type heat sink which has a high pressure-resistibility and is resistible against the corrosion or erosion-corrosion or electrolytic etching, and a method for its production. The controller detects driving conditions of the vehicle, estimates a traction load of the vehicle and determines a current traction load of the vehicle. The pulse transmitter transmits pulse signals proportional to the volume of fuel that is being pumped.