Do you still have the old pump that presumably worked at some time prior to the purchase of the new pump(s)? If so, I'd contact Then and Now to see if they can rebuild it. If it's a modern Chinese pump, I wouldn't waste the effort. Find an NOS or used pump from the 1950s or 60s and send it to them.

1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)