Abstract: A device for monitoring air pressure in the tires of a vehicle includes devices for determining the wheel speed or other characteristic variables for the speed of the tires of the vehicle, a device for calculating differential variables on the basis of the wheel speed variables, a device for evaluating the differential variables with respect to a setpoint value deviation and for generating a warning signal if the setpoint value deviation exceeds a threshold value, and a device for directly measuring the air pressure in the tire of a wheel and for transferring an air pressure characteristic variable to the evaluation device. A warning signal is generated if the deviation of the air pressure characteristic variable with respect to a setpoint value exceeds a corresponding threshold value. A method of monitoring tire pressures is also provided.

Abstract: A device for monitoring air pressure in the tires of a vehicle includes devices for determining the wheel speed or other characteristic variables for the speed of the tires of the vehicle, a device for calculating differential variables on the basis of the wheel speed variables, a device for evaluating the differential variables with respect to a setpoint value deviation and for generating a warning signal if the setpoint value deviation exceeds a threshold value, and a device for directly measuring the air pressure in the tire of a wheel and for transferring an air pressure characteristic variable to the evaluation device. A warning signal is generated if the deviation of the air pressure characteristic variable with respect to a setpoint value exceeds a corresponding threshold value. A method of monitoring tire pressures is also provided.

Abstract: To diminish the escape of fuel vapors from a fuel tank filling tube during filling of the tank, a valve is provided that is switched by insertion of a fuel pump nozzle into the filling pipe so that fuel vapors escaping upon filling of the fuel tank are transmitted with comparatively low flow resistance to an active carbon receptacle. When the fuel pump nozzle is removed from the filling tube, the valve is returned to its normal operating position in which venting of the tank takes place through an upper portion of the tank filling tube and through a gravity valve and a pressure holding valve.

Abstract: A tank for automobile fuel, having a back-up tank contained therein to maintain a minimum fuel level about the opening of the fuel suction line during vehicle acceleration conditions, has a back-up tank assembly and related components, such as a filter, a pump and guide walls forming funnels, all of which can be inserted and secured in the tank through an opening therein after fabrication and installation of the tank.