Identify this 40018 fuel pump?

[Verne_Frantz]

Thanks Rick. I know that number is applied to those applications as a replacement, but I was wondering which factory installations would use one of this style. At least up through '64, all original pumps were the screw together type and not a sealed unit like this one. I was hoping the 325M prefix might be a clue.

Verne

[Mr70]

No cover screws means it's a Unitac design,so no diaphragm or repair kits were available for it.325M is saying it's a late 1960's vintage replacement variation (1966 I believe) from the original cover screw design of the 1950's-early 1960's.