Process for manufacturing a fuel tank equipped with an internal accessory

A process for manufacturing a fuel tank equipped with an internal accessory and having a plastic wall produced from a parison, said process comprising, in order, the following steps:

• a) the accessory and the molten parison are introduced into a mould so that the accessory is surrounded by the parison, said mould comprising cavities equipped with at least one moving part;
• b) a pressurized gas is introduced inside the parison to carry out a pre-blow moulding of said parison;
• c) the pre-blow-moulded parison is pressed by the moving part against the accessory in order to firmly attach the accessory and parison without piercing the parison;
• d) the mould is closed and the final blow moulding of the parison is carried out by flattening it against the mould cavities using the pressurized gas;
• and
• e) the tank is removed from the mould;
• wherein when the mold is open, the moving part projects into the mold and when the mold is closed, the moving part does not move so that it is retracted inside the mold in order that its end is able to conform to the internal surface of the cavity on which it is found when the mold is closed.