I have this Holley carburetor on a 292 in my '54 Mercury Convertible.  When this car was not in my possession it sat outside under a cover for over 7 years.  I got the engine started running it from a gas can but I have to prime it to restart it and it sputters and dies on quick acceleration.  I looked down the throat and I can see that the accelerator pump is not pumping streams of fuel down the throat when I open the throttle so it looks like the pump diaphragm is probably ruptured from age.  Can I just replace the pump diaphragm without doing a total carburetor rebuild?  Is just that part available and if so how can I know that I am buying the correct one for this carburetor?  Is the accelerator pump located inside that rectangular cover at the front of the carburetor?  Thanks72% of original size (was 701x19) - Click to enlarge