Abstract: A fuel tank for a motor vehicle comprising a wall composed of two shells arranged one above the other. The outer shell of the wall preferably has an inlet orifice and an outlet orifice. A filter element is arranged in front of the outlet orifice. Scavenging air from the inlet orifice thereby passes first into a gap between the shells and subsequently to a filter element. As a result, fuel vapors can no longer diffuse through the wall and pollute the environment.

Abstract: In a fuel feed unit (3) for a motor vehicle, a suction jet pump (6) provided for filling a baffle (2) of a fuel tank (1) is manufactured in one piece with a holding part (4) for a fuel pump (5). The holding part (4) is of pot-shaped design for receiving the fuel pump (5) and carries a fuel filter (7) on a vertical wall (8). Fuel thereby passes to the suction jet pump (6) immediately after the fuel pump (5) has been started up.

Abstract: A fuel tank having an inlet and an outlet is connected to a separate pressure vessel by means of a pump. Fuel vapors are pumped out of the tank and into the pressure vessel while the tank is being filled via the inlet, so that fuel vapors cannot escape during filling. After filling, the inlet is closed and the pressure in the tank is increased to about 4 bar by means of a pressure regulator in a line connecting the pressure vessel to the fuel tank. The pump is then switched off and the fuel can be delivered to the engine via the outlet under the increased fuel pressure in the tank, the pressure being reduced to fuel system pressure by a pressure regulator in the outlet line.

Abstract: A fuel pump for a motor vehicle has an outlet duct leading to an internal combustion engine and a connection leading to an ejector, and two delivery chambers which are separate from one another. The delivery chambers are concentric so that one surrounds the other. The fuel pump is simple to construct and can be manufactured at favorable cost.

Abstract: A level transmitter for a liquid container includes a simple construction without feed lines to the sensors through the container wall. The level transmitter has a plurality of sensors made from magnetostrictive material, which are excited to oscillate by an alternating magnetic field emitted by a transceiver unit. The sensors oscillate at different frequencies which are detected by the transceiver unit. The detected signals are fed to an evaluation unit and used to form a signal for the level. The level transmitter and the method are particularly suitable for use in fuel tanks in motor vehicles.

Abstract: A fuel tank for a motor vehicle, having a wall (3) which is manufactured from plastic, in particular by injection molding, is provided on its inside with a permeation barrier (4). The permeation barrier (4) is manufactured from a material which is virtually impenetrable for fuel vapors. The permeation barrier (4) is composed of shell parts (5, 6) which are welded to one another.

Abstract: A fuel cell system which has a fuel cell with a supply line and a discharge line for a fuel as well as a supply line and a discharge line for an oxidizing agent. Also provided is a fuel tank which contains, for example, benzene or methanol for producing the fuel for the fuel cell. To avoid the release of hydrocarbons from the fuel contained in the tank, a filter element, for example an active carbon filter, is connected to the fuel tank. To be able to regenerate the filter element, the filter element is connected to the discharge line for the oxidizing agent and/or the discharge line for the fuel. The filter element is regenerated by the flow of exhaust gas from the fuel cell. The filter element is preferably connected via a connecting line to a burner, with the result that the hydrocarbons taken up by the flow of exhaust gas can be burned in the burner. Furthermore, by designing the fuel cell system appropriately, a leakage diagnosis can also be performed in the fuel tank.

Abstract: In a method of producing a fuel tank from plastic, a heating element is located between two shell parts to be welded to one another. When the shell parts are pressed together, the heating element melts into the plastic and produces a weld that provides a fuel-resistant seal. The fuel tank subsequently has a particularly exact shape.

Abstract: A fuel tank for a motor vehicle comprising a wall composed of two shells arranged one above the other. The outer shell of the wall preferably has an inlet orifice and an outlet orifice. A filter element is arranged in front of the outlet orifice. Scavenging air from the inlet orifice thereby passes first into a gap between the shells and subsequently to a filter element. As a result, fuel vapors can no longer diffuse through the wall and pollute the environment.

Abstract: A plastic tank comprises a line which is connected at least in certain sections to its wall and is formed in one piece with the plastic tank. For its production, the plastic tank is injection-moulded between a hollow mould and an inner mould inserted into the latter, the mould having a recess, in which a sprue body is formed as the starting material for the line. Before this sprue body can solidify completely, material is blown out from it by means of the internal gas pressure or pressure blowing technique via channels provided in the mould, so that the required line is created there. The lines may be arranged on the outside and/or inside and parallel and/or at an angle to the tank walls.

Abstract: In a fuel feed unit (3) for a motor vehicle, a suction jet pump (6) provided for filling a baffle (2) of a fuel tank (1) is manufactured in one piece with a holding part (4) for a fuel pump (5). The holding part (4) is of pot-shaped design for receiving the fuel pump (5) and carries a fuel filter (7) on a vertical wall (8). Fuel thereby passes to the suction jet pump (6) immediately after the fuel pump (5) has been started up.

Abstract: A filling level sensor (2) for a fuel container (1) of a motor vehicle has two lever arms (4, 5). One of the lever arms (4) supports a float (10), while the other lever arm (5) is prestressed against the bottom of the fuel container (1). A detecting device (6) for detecting the filling level in the fuel container (1) determines the difference between the positions of the lever arms (4, 5). The detection of the filling level in the fuel container (1) is hereby rendered very accurate.

Abstract: A fuel supply system for a motor vehicle has two feed units arranged in a fuel tank. The feed units in each case feed fuel out of baffles to an internal combustion engine of the motor vehicle and to suction jet pumps. This ensures a reliable supply of fuel to the internal combustion engine, even in the case of a very high fuel requirement and in the case of an angled design of the fuel tank.

Abstract: A fuel cell system which has a fuel cell is described. Also provided is a device for producing/preparing the fuel, for example hydrogen, which is connected on its outlet side to a fuel supply line and on its inlet side to a device for supplying fuel. The device for supplying fuel has a dual pump, in which a starting material for the fuel, stored in the motor-fuel tank, and water fed in via a water supply line, which is for example process water produced during the fuel cell process, are mixed to form a fuel/water mixture. This fuel/water mixture is intermediately stored in an intermediate tank before it is fed to the device for producing/preparing the fuel.

Abstract: A device for supplying an internal combustion engine (1) of a motor vehicle with fuel has a return line (4) which is passed into a fuel tank (2) and has a wall made of a material of high thermal conductivity. The return line (4) is arranged within a ventilation duct (5). Cooling air is conveyed through the ventilation duct (5) to the return line (4). This is a simple means of limiting the maximum temperature of the fuel in the fuel tank (2).

Abstract: In a fuel supply system for diesel engines, which comprises a fluidic series connection of a fuel pump (5) sucking out of a tank (1), of a fuel filter (7) and of a high-pressure pump (9), a parallel connection, located downstream of the high-pressure outlet (14) of the high-pressure pump (9), of a plurality of injectors (16) or injection nozzles and of an electrically controllable high-pressure regulating valve (17) with a return line (20), said parallel connection being capable of being fed by the high-pressure pump with a fuel stream under a pressure which is variable, as required, by the activation of the high-pressure regulating valve, at least one return line (18) for recirculating a fuel excess from the high-pressure regulating valve and/or the injectors into the tank (1), and at least one cooler (19, 21) arranged in a return line, according to the invention a first return line (18) is located downstream of the injectors (16) and a second return line (20) downstream of the high-pressure regulating v

Abstract: A flow valve for a fuel supply system is arranged in a supply line leading to an internal combustion engine and, in a basic position upon the start of the internal combustion engine, closes a branch line which leads to a sucking-jet pump. For this purpose the flow valve has a closure member which is displaceable substantially transverse to the direction of flow by the flow of the fuel.