Hello,
You lost me a bit there, but you may be able to help me.
I got my car to start after many years of non use
I had a leak on the fuel bowl, so decided to clean it out.
The filter has a diaphragm control, this was in a mess, having cleaned the whole lot, and not altering the pressure setting, on starting the electric pump, independent to starting the car, I had a deluge of petrol coming from the carb overflow pipes. ( small bore tubes from the top of the carbs)
It seems the gummed up diaphragm must have controlled the flow and I have may be increased the flow some how.
So, I will need to get a new diaphragm and filter, soon, but I think until I get these, I can still run the car if I can reduce the fuel pressure to a correct level to stop the overflow, I don't think the carbs non return valves are the problem
HIF6 carbs
P6 3500 auto
1974
Thank you
Brian