The earlier versions of both pumps used the "THICK" cast bottom plate. They now use the harder/thinner plate which is stronger than the early cast thick plate. The M54DS is the 60 lb high volume, (not high pressure). The M54F is the high pressure 80 lb pump. http://www.melling.com/engoil.html http://www.melling.com/highvol.html
[ June 05, 2002, 05:13 PM: Message edited by: Robert Williams ]
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