Where to buy a rebuilt fuel pump for 52 Hornet?

Neils, do you have a core?

Then and Now
http://dragsite.tripod.com/antique_auto_parts_cellar.htm
They sell full kits or rebuild yours.

FUEL PUMP REBUILDING SERVICES: LAbor and kit parts
(Arm repair, linkage, spring and casting replacement extra.

SINGLE ACTION PUMPS: AC, AC-STYLE & CARTER: $ 85.00

DUAL ACTION PUMPS: AC, AC-STYLE & CARTER: $ 125.00

MARINE AC DUAL DIAPHRAM AND MOST FOREIGN PUMPS: $ 100.00

Your pump is disassembled, bead blasted, and re-assembled
with our new stock parts and tested for pumping action and leaks.
Castings and arm and linkage are checked and repaired or replaced as required, sometimes at additional charge.

SHIPPING & HANDLING: $12.50 Minimum by surface
Third, second and next day services additional international shipment available.

All Our Kits contain, where applicable:
Diaphragms: diaphragm cloth if diaphragm was originally held
together by a nut and washer, OR complete staked assemblies
(cloth, metal protector plates, and pull rod) where
required as original.
(you are never expected to stake a diaphragm together yourself-
if you have a kit of ours and find you must- call us for help!)
Check Valves or Valve and Cage: whether the early flat plate and separate
spring style or one-piece, modern caged style
- Check Valve Gaskets - Gasket to cyl. block
- Filter Bowl or Pulsator Gaskets - Filte r Bowl Screens
- Oil Seals & Retainers - Rocker Arm Springs
Most Kits also provide:
Rocker Arm Pins and Rocker Arm Bushings (if they don't we don't
recommend taking the pin and the arm out. The old castings may
be too fragile!)