Abstract: A fuel tank includes a vessel having a wall, the wall includes at least a first layer forming a hydrocarbon barrier, and a second layer that is more permeable to hydrocarbons than the first layer and is located on an outside of the first layer. The fuel tank also includes an insert defining a passage between an inside of the vessel and an outside thereof. The insert includes a first end overmolded by the wall and a second end opposite to the first end projecting outside the vessel. The wall has a portion extending inside the insert around an opening of the wall, the insert being configured to form at least one region of reduced thickness in the second layer along a diffusion path for hydrocarbons diffusing along the second layer from an edge of the wall adjacent to the opening towards the outside of the vessel.

Abstract: The invention relates to a method of manufacturing at least one hollow element of a fuel system (3), especially a casing of a fuel tank. It comprises the following steps: (a) introducing the element or elements to be treated into a treatment chamber (2) equipped with at least one microwave generator, (b) injecting a reaction gas into the chamber while enabling the gas to enter inside the said elements, (c) subjecting this gas to microwave radiation delivered by the microwave generator (4), at a frequency and intensity chosen so as to create a plasma in the chamber and to bring about the coating of a material, arising from the decomposition of the reaction gas, on the said element or elements, preferably on both the inner and outer faces of the said element or elements.

Abstract: A method of making a blown vessel provided with a passage suitable for putting the inside of the vessel into communication with the outside thereof and including a mouth on the outside, said method comprising the following steps:

Abstract: A method of making a blown vessel provided with a passage suitable for putting the inside of the vessel into communication with the outside thereof and including a mouth on the outside, said method comprising the following steps: overmolding an insert of tubular shape in a parison while it is being blown so that the parison covers one of the ends of the insert, while leaving the opposite end of the insert projecting outside the vessel so as to constitute the outside mouth of the passage, the vessel made from the parison having at least a first layer forming a hydrocarbon barrier and a second layer that is more permeable to hydrocarbons than the first and that is outside it; and then eliminating at least a portion of the wall lying inside the insert, the insert being shaped to lengthen the diffusion path for hydrocarbons diffusing along the second layer from the edge of the vessel adjacent to the removed wall portion towards the outside of the vessel, and/or to form one or more regions of reduced thickness i