My father in law recently purchased a Fill Rite Series No 56.

He has been frustrated at not being able to find any information about them online.

He met a local gas pump guru who was adamant that it was a hastily slapped together collected piece that was assembled in someone's backyard.

He went as far to contact Fill Rite and he was sent the user manual for it. (Pictured below)

Any information would be appreciated.