A customer of mine has a new MP six pack on his 440.
If he leaves the car sit for a week or so, the carbs seem to empty themselves out only leaving enough fuel to MAYBE fire once. Then you crank and crank and crank and crank and crank and nothing happens...
You remove the shaker bubble PITA, and pour gas down and she fires right up and works perfectly fine with all the float bowls adjusted and working properly...
Let it sit again and it's the same process all over again...
What would cause the fuel system to empty out like that ?
