Process for manufacturing a plastic fuel tank

Process for manufacturing a fuel tank (1) having a plastic wall, according to which: 1. a plastic parison comprising two distinct parts is inserted into an open two-cavity mould; 2. a core is inserted inside the parison, said core bearing two parts of a reinforcing element (3,4) capable of securing (creating a link between) two different locations inside the parison; 3. the parison is pressed firmly against the mould cavities (generally by blowing through the core and/or creating suction behind the cavities); 4. the two parts of the reinforcing element (3,4) are fixed at the two locations of the parison using the core; 5. the core is withdrawn; 6. the mould is closed again, bringing its two cavities together in such a way as to grip the two parts of the parison around their periphery in order to weld them together (2); 7. a pressurized fluid is injected into the mould and/or a vacuum is created behind the mould cavities in order to press the parison firmly against the mould cavities; 8. the mould is opened and the tank (1) is extracted; 9. an opening is made into the tank wall; and 10. through said opening, at least a third part of the reinforcing element is put in place in order to link/connect the two first parts together.