Kent - ALL Carter YF's use the neopreme diaphragm style pump. Part number is 203-43s, but I doubt you will be able to buy the pump diaphragm without buying the repair kit.

Jon.

Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify.
If you truly believe "one size fits all," try walking a mile in your spouse's shoes!
The Carburetor Shop