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what is the easiest way to replace a fuel pump diaphram on a 1976 harley gas golf cart.

Kat, Search the net for your models fuel pump rebuild kit, to make sure it is available. Remove fuel pump from carts engine, disassemble pump, remove diaphragms noting placement/order(take pictures if you like) and replace with new diaphragm/s, reassemble and try it out. Fuel pump diaphragm for 1963-1981 carts Part No: 27809-63A https://golfcardiscounters.com/cart/prod

katlou19 here is the Fuel System part of the service manual. HD Golf Cart Fuel System. Page 3-20 addresses that issue and will show you how to work on it.