[paul2748]

Have you ever taken the gas cap off the car when it died? If so, did you get a whooooosing sound ? If so, that means the vented cap (most 56's used a vented cap) isn't working. The fuel system needs a vent to equalize pressure the air inside the tank.


Or run the car w/o the gas cap on and see if it still dies. If it does, then the vent system is not the problem. If it doesn't die, then maybe your problem is the vent system (vented cap.)


Another possible cause is something in the tank (I know you said it looked clean) There could be something that is being sucked into the outlet tube which cuts off the fuel. When the car dies, suction is gone and it drops back into the tank. Restart the car and it get sucked into the outlet again.