As a Packard guy I am attempting to find out which model Hudson's & Nash's used Packard Engines. I believe it was between 1955 and 1957 that Packard V-8 engines where used. My understanding is that these Packard engines used a dual action fuel pump to provide Vacuum rather than taking vacuum off the oil pump as Packard did. I am trying to locate one of these fuel pumps to use on my 56 Packard instead of using the vacuum off the oil pump. Is there anyone who can give me some assistance on this?