I have always run electric fuel pumps and never had a problem. Both are S-W pumps and I do carry a spare, just in case. Some people prefer a mechanical pump because if in the event of a failure you can get a replacement at many auto parts stores. A matter of personal choice is my opinion. If you have had no problems with your mechanical up to now, then it probably would be best to do as Denny has suggested and that is to replace the old one with a new one now. You could always carry the old pump as a spare, if you have room for it.

Denny is also right about the fuel psi at the carb. 5 psi would be ideal anything over that will cause problems. New carb and intake would be good.