What kind of info are you looking for? There is a section on rebuilding that style pump in the 51-4 service manual. Photos show the 51 pump but they used essentially the same pump thru 54 -- although some small details might have changed, the info and procedure is valid for all. You can download section XII --Fuel and Exhaust -- of the service manual
https://www.packardinfo.com/xoops/html/downloads/servicemanual5154/FuelExhaust_XII.pdf from the literature section.
If you want to rebuild yourself, you can buy a rebuild kit from the regular Packard vendors Kanter Auto or Max Merritt or from Then and Now
http://then-now-auto.com/fuel-pump-repair-kits/ You can also have Then and Now or Arthur Gould
http://arthurgouldrebuilders.com or others rebuild yours. You can also buy already rebuilt pumps on an exchange basis from the vendors.
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