fig1 shows a fuel container for commercial vehicles with a carrying structure 1 and a plastic sintered layer 2 applied to the inside of the carrying structure 1 and with a filler neck 5 . the plastic sintered layer 2 in this case has a thickness of approximately 2 to 3 mm . in the present exemplary embodiment , it covers the entire inner surface of the vehicle tank , in particular also the surface of the baffle 3 and of the urea container 6 designed as a separate container . by means of the peripheral undercuts 8 a and 8 b which are likewise covered by the plastic sintered layer 2 , the latter is additionally stabilized mechanically and retained against the inside of the carrying structure 1 . the steps 4 a , 4 b , 4 c are formed in an additional segment 7 of the fuel container . fig2 shows a variant of a container , the container having the two part containers 6 and 11 which are connected to one another by means of the peripheral weld seam 9 . in this case , the part container 6 is a urea container with a plastic sintered layer 2 . the part container 11 is a fuel container in which a plastic inner coating is not required . furthermore , the part container 11 has a filler neck 5 . the peripheral weld seam 9 is formed with a spacing of approximately 150 mm from the internally coated part container 6 by means of the projection 10 , so that a welding of the carrying structures 1 of the two part containers 6 and 11 can take place without the plastic sintered layer 2 being put at risk . the production of the container according to the invention is thereby appreciably simplified . in this exemplary embodiment , too , the steps 4 a , 4 b , 4 c are formed in an additional segment 7 of the part container 11 . the push - in element 13 , illustrated diagrammatically in fig2 , which is designed as a filling level sensor with an integrated heating element is arranged in the part container 6 . the push - in element 13 , too , like the inside of the part container 6 , is covered by the plastic sintered layer 2 . furthermore , the push - in element 13 is stabilized mechanically by the auxiliary structure 14 , arranged in the lower region of the part container 6 and likewise covered with the plastic sintered layer 2 , in such a way that the auxiliary structure 14 is arranged at a spacing of a few millimeters from the push - in element 13 and prevents a pronounced distortion or change in position of the push - in element 13 . moreover , the passage orifice 16 which is pierced by the filler neck 15 is located in the upper region of the part container 6 . the geometry of the filler neck 15 is in this case selected such that the filler neck 15 widens in the direction of the interior of the part container 6 . this affords an undercut by means of which the hold of the plastic sintered layer 2 on the inside of the part container 6 is further improved .