Process for manufacturing a hollow body

It is proposed a process for manufacturing a diesel tank or filler pipe by means of an extrusion-blow moulding machine suitable for manufacturing a gasoline tank or filler pipe. The extrusion-blow moulding machine is equipped with a coextrusion head (1) comprising at least one extruder being configured to provide during a first period of time a first material that is a barrier to liquids and/or gases, such that during the first period of time the coextrusion head produces a first multilayer parison from which the gasoline tank or filler pipe can be manufactured. The extruder is such that it is further configured to provide during a second period of time a second material distinct from the first material, such that during the second period of time the coextrusion head produces a second multilayer parison from which the diesel tank or filler pipe can be manufactured.