Abstract: An electric-motor-powered centrifugal fuel pump including a vacuum control device to achieve the initial priming of the centrifugal pump. The electric motor which drives a centrifugal impeller is housed within the pump itself and, as such, is immersed in the fuel being pumped. An associated filter bowl incorporates a float valve, thus becoming a filter and float bowl which controls the vacuum so that when the fuel level reaches a predetermined point, the float valve rises and engages its valve seat, thus shutting off the vacuum source. A secondary ball valve is also provided in the vacuum line so that, in the event of the vehicle's overturning, this ball valve will close the vacuum line and prevent gravitational fuel flow to the vacuum source. When the vacuum draws sufficient fuel into the centrifugal pump cavity, the centrifugal impeller is then capable of discharging this fuel under pressure through the filter to an outlet port that is connected to the carburetor.

Abstract: An air core gauge is provided with a plurality of angularly oriented coils. Switching means are connected to the coils in order to control the flow of current therethrough. Pulse generators responsive to variations in frequency of electrical signals representative of a condition, such as vehicle speed or engine RPM, control the switching means so as to cause excitation of the coils to produce a resultant mmf vector, the angular position of which is related to the frequency of the signals. The resultant mmf vector causes a magnet and associated pointer to rotate to thereby provide an indication of the value of the condition.