Abstract: Fuel system intended for a heat engine and comprising a fuel tank, a pipe for filling the tank and a pump for supplying the engine with fuel. The pump is supplied with fuel from a fuel reserve container, the fuel system additionally including a retaining trough independent of the reserve container, positioned so that the reserve container is supplied with fuel from the trough and having a wall defining a volume emerging at the upper part through an opening in the tank. The wall forms a continuous envelope separating the volume of the trough from the rest of the tank.

Abstract: Device and associated method for attaching a component (1) to a hollow body with a wall (4) made of plastic of multilayer structure comprising at least one layer of barrier material (5), the device comprising one or more O-ring seals (6) arranged in a groove formed at the periphery of the component (1) or in the wall (4) of the hollow body, at least one of the O-ring seals (6) being compressed radially and being in contact with the layer of barrier material (5). Fuel system for motor vehicles comprising a tank and at least one component (1) attached to the tank by this device.

Abstract: A system for fastening, by welding, a component having a portion with a conical surface profile to a motor vehicle fuel tank that includes an opening whose perimeter has a conical surface profile. The welding is carried out between at least one portion of the conical surface of the perimeter of the opening in the tank and at least one portion of the conical surface of the component.

Abstract: The invention relates to new plastic materials made of heterogeneous copolymers of vinylidene fluoride and chlorotrifluoroethylene, consisting of elastomeric nodules of heterogeneous copolymers of vinylidene fluoride and chlorotrifluoroethylene which are dispersed in a crystalline continuous phase of quasi vinylidene fluoride polymer.According to another feature, the plastic materials are made of heterogeneous copolymers containing overall approximately from 10 to 22% by weight of CTFE and exhibiting a melting temperature of at least 165.degree. C. and a flexural elasticity modulus of not more than 1000 MPa. The heterogeneous copolymers are obtained by a radical copolymerisation in aqueous medium, all of the comonomers being introduced at the beginning of the copolymerisation.The plastic materials can be employed for the manufacture of flexible articles such as flexible tubular articles, sheathing for cables, coatings and films.