Abstract: A fuel delivery system for an engine operated with a gasoline/alcohol fuel mixture in which a fuel pump delivers fuel from a fuel tank to a fuel feed device on the engine. According to the invention the fuel pump is immersed within the fuel in the fuel tank and a fuel return line is connected to the pressure side of the pump for returning fuel directly to the fuel tank.

Abstract: A reaction carburetor for an internal combustion engine which operates to catalytically convert fuel from the liquid to the gaseous state for improved combustion. According to the invention, means are provided for stabilizing the flow of fuel and air in the carburetor. The stabilizing means include at least one temperature-stable body, arranged in the fuel-air flow path ahead of the catalyst, having a plurality of flow channels extending therethrough in the direction of the flow path.

Abstract: An internal combustion engine operated with a gasoline-methanol mixture as fuel comprises a fuel system, a water-absorbing filter and a ventilating line passing through the filter. When moisturized air is flowing through the ventilating line, the filter removes the moisture so that the fuel system is ventilated with dry air.

Abstract: A mixture-drawing internal combustion engine comprises a cooling water circulation system, an intake conduit and an automatically controlled heating device in heat exchange contact with the intake conduit. The heating device receives cooling water from the cooling water circulation system and exhaust gases from the internal combustion engine. A shutoff device controls the flow of the cooling water through the heating device. The shutoff device remains closed until a predetermined cooling water temperature is reached. When the predetermined cooling water temperature is reached, the shutoff device opens increasingly as the temperature of the cooling water rises.