This system assembles several sizes and styles of base plate/fitting/element/end cap sub assemblies for fuel filters. The first machine in the system feeds and loads the filter base plate and then feeds, loads and presses either a nut or a barb fitting into the filter base plate. This base plate sub assembly is then fed into a laser welder that penetration welds the two parts together. The welded sub assembly is then fed by a conveyor system to a final element assembly machine where it is flipped over and loaded into a nest, then filled with Plastisol. Another machine feeds the end cap into a carousel inline machine and fills the end cap with Plastisol. These filled end caps are then advanced to a station where an operator inserts the filter element into a transfer block over the end cap. The machine pushes the element into the end cap and verifies that the proper element was inserted and it is fully seated.