Disclosed is a method for limiting fuel leakage from at least one injector in an engine of a motor vehicle, the engine being stopped and the motor vehicle ignition circuit being switched off, the injector being supplied with fuel via a fuel rail which is pressurized during operation, the pressurization persisting for a certain period when the engine has been stopped and the ignition circuit switched off, leading to leakage of fuel through the injector. The injection rail is subjected to forced cooling following the stoppage of the engine with the motor vehicle ignition circuit switched off, which is sufficient to reduce the pressure, the forced cooling continuing until the pressure in the rail is close to atmospheric pressure.

The invention relates to a high-pressure fuel pump (1), in particular of a common rail injection system of an internal combustion engine, having a pump cylinder head (3), having an intake valve (6) arranged in the pump cylinder head (3) in the direction of a pump cylinder axis, and a high-pressure fuel outlet (5) arranged laterally on the pump cylinder head (3), wherein a protective cap (10, 10a) at least partly covering the high-pressure fuel pump (1) is provided. According to the invention, a high-pressure fuel pump (1) having a protective cap (10, 10a) is provided, in which the protective cap (10, 10a) can be mounted without difficulty on an assembled high-pressure fuel pump (1). This is achieved in that a plug (8) having a lateral lead connection (9) is placed on the electrically operated intake valve (6), and the protective cap (10) is formed in two pieces and has two protective cap parts (11a, 11b) that can be fitted to each other, or else in that a plug (8) having a lateral lead connection (9) is placed on the electrically operated intake valve (6), and the protective cap (10a) is formed annularly and has a free clearance slot (19) interrupting the ring.

An engine fuel cooling system for vehicles exchanges heat between fuel and a flow of cold liquid in a coaxial fuel rail. The coaxial fuel rails include an inner fuel path through an inner tube surrounded by an outer cold liquid path through an outer tube, to cool the fuel provided to fuel injectors. The inner tube has no substantial direct contact with the outer tube to prevent external heat from being conducted to the inner tube. In one embodiment, the inner tube is solely supported by an fuel inlet fitting and injector hats teaching through the outer tube and into the inner tube. The coaxial fuel rail may be constructed using dip soldering.

A pump device for an internal combustion engine, having a high-pressure fuel pump for supplying fuel to a first injection device, having at least one low-pressure inlet, via which the fuel is fed to the high-pressure fuel pump from a low-pressure fuel pump, having at least one low-pressure outlet for conducting the fuel conveyed by the low-pressure fuel pump and fed via the low-pressure inlet to the high-pressure fuel pump out of the high-pressure fuel pump, and having at least one low-pressure port, for conducting fuel conveyed by the low-pressure fuel pump to a second injection device. At least one mixing region mixes the fuel flowing through the low-pressure outlet with fuel fed to the mixing region from the low-pressure fuel pump upstream of the high-pressure fuel pump. The low-pressure port is fluidically connected to the mixing region, and the low-pressure inlet is supplied with fuel from the mixing region.

A high-pressure pump arrangement for a combustion engine comprises a high-pressure pump with the first flange, a pump guidance with a second flange. The high-pressure pump is at least partially arranged in the pump guidance and the pump guidance is arranged in the combustion chamber. A first thermally insulating layer is at least partially arranged between the first flange and the second flange.

A high-pressure pump arrangement for a combustion engine comprises a high-pressure pump with the first flange, a pump guidance with a second flange. The high-pressure pump is at least partially arranged in the pump guidance and the pump guidance is arranged in the combustion chamber. A first thermally insulating layer is at least partially arranged between the first flange and the second flange.

A fuel system for an internal combustion engine includes an electric fuel pump; a conduit which defines a flow path through which fuel flows from the electric fuel pump to the internal combustion engine; a fuel pump control module with electronics which drive the electric fuel pump, the fuel pump control module being disposed within a compartment defined by a wall; and a heat sink in thermal contact with the fuel pump control module and extending out of the compartment through an aperture of the wall and into the flow path such that the heat sink is sealed to the wall, thereby preventing fluid communication through the aperture.

A fuel system for an internal combustion engine includes an electric fuel pump; a conduit which defines a flow path through which fuel flows from the electric fuel pump to the internal combustion engine; a fuel pump control module with electronics which drive the electric fuel pump, the fuel pump control module being disposed within a compartment defined by a wall; and a heat sink in thermal contact with the fuel pump control module and extending out of the compartment through an aperture of the wall and into the flow path such that the heat sink is sealed to the wall, thereby preventing fluid communication through the aperture.

A fuel system for an internal combustion engine includes an electric fuel pump; a conduit which defines a flow path through which fuel flows from the electric fuel pump to the internal combustion engine; a fuel pump control module with electronics which drive the electric fuel pump, the fuel pump control module being disposed within a compartment defined by a wall; and a heat sink in thermal contact with the fuel pump control module and extending out of the compartment through an aperture of the wall and into the flow path such that the heat sink is sealed to the wall, thereby preventing fluid communication through the aperture.

A fuel system for an internal combustion engine includes an electric fuel pump; a conduit which defines a flow path through which fuel flows from the electric fuel pump to the internal combustion engine; a fuel pump control module with electronics which drive the electric fuel pump, the fuel pump control module being disposed within a compartment defined by a wall; and a heat sink in thermal contact with the fuel pump control module and extending out of the compartment through an aperture of the wall and into the flow path such that the heat sink is sealed to the wall, thereby preventing fluid communication through the aperture.