I opened the drawing attached to this assembly and it came up with an odd issue. The lines in the attachment that appear to be hidden lines shouldn't be that way. When I open the subassembly that contains just the tank weldment, there aren't any issues. Hidden lines are, of course, removed; all other display styles seem to work fine. It doesn't appear to be showing the hidden lines, its just converting the standard lines into that format. Has anyone else encountered this problem?
In the Drawing, right-click on the Part that's showing the dotted lines, either in the graphics area or in the tree, and choose "Component Line Font..." from the drop-down. It looks like someone over-rode the line type there. Selecting "Default" at the top should bring it back to solid.