Hello, we have a 68 GTO convertible that is garaged and hasn't been plated since 74. We're in the process of getting it ready to license again. We have started it up occasionally about few months or so, and have always needed to use ether to get it started. It will restart without the ether the same day, and usually the next day, but if we wait for several days or a week, it will need the ether to start up. Not sure if this is possible or even makes sense, but I'm guessing that possibly the fuel is flowing back into the tank and away from the carburetor if the engine sits for any amount of time, and it's needing the kick from ether to essentially prime the suction of fuel from the tank. Does that make any sense at all, and does anyone have any idea what might be causing this? BTW, I suspect the fuel sending unit may be bad. Could this be a contributing factor? Thanks.