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I would reach out to Stanadyne, you might get some valuable information. http://www.stanadyne.com/contact/

Case Closed, 12 volt unless somebody screwed it up and cut off the old connectors.

Pull the top cover and get me the part numbers. The 24 volt fuel relay which is the bigger one if 24 volts is much bigger Sent from my iPhone using Tapatalk

A 6.2 and 6.5 pump are only different in the following manner from a practical matter. 1.) 6.5 a bit greater fuel flow 2.) The IP relay's in the top end of the pump are 24 volt on the 6.5 HMMWV pumps. You can purchase the 12 volt relays if you do get a 6.5 pump.