Did you ever get this figured out? My 67 is doing the same thing today after adding about 7 gallons to an almost empty tank. It was fine yesterday after a longer drive with more fuel - odd.
I'm wondering what others thoughts are here as I'm not seeing ANYONE discuss the harsh reality thats headed our way unless folks step up - OK THIS ISN'T POLITICAL at this point so somehow let's keep it that way or move the thread to?