Perko has come out saying that they came across a problem with the fuel fills having a brittle area on the flange of the plastic body fuel fills. Because it is brittle, the fuel fill can crack when the mounting screws are tightened. The manufacturing dates of the affected fuel fills are from April 2011 to May 2011. The following part numbers with all variations are involved:
The images below show you how to find the manufacturing date for the fuel fills involved:
This is where you will find the date for all model variations for 0540, 0580, and 0582.
And this will be where it is located on 1319.