Discussed this issue with Melling at length. Here are the highlights for what it's worth. Hopefully some will find it useful. 1) The redesign was tested by both Melling and GM for fatique prior to release with no reliability issues. 2) Since being redesigned over 2,000,000 pumps have been shipped and sold. 3) Melling knows of 12 failures on these pumps following this redesign. One or two of them may be of the older design as they were never returned and conversations seemed suspect due to the estimated install date of the pump. 4) Applications under which the pumps failed have been soup to nuts, many appeared to be pretty hard core applications. 5) Melling is redesigning the pump not due to a statistically valid design issue but for customer service. This is currently underway. The folks in the Melling booth were some of the best company reps we talked with all weekend. Top shelf company and the source for the best information on what will work for your particular application.