Just a note of interest. In a normal installation (not a remote needle), the needle valve does not see any of the tank pressure created by the Cline fuel system. It only sees the fuel waiting on the outlet of the Cline waiting to be drawn in by the carb (at zero pressure). Only when the carb draws fuel does the Cline needle move since it senses a drop in inlet pressue. So that tank pressure just makes the fuel enter very quickly to replentish the fuel that the carb is drawing. I always thought that the Cline essentially makes the Carb think that the fuel tank is always 3/4 of an inch away from the needle valve, and always at the same attitude.

When the engine stops and there is pressure in the fuel tank, the Cline needle is fully closed and the carb sees none of that pressure. If it does, and there is fuel leaking out of the carb, the Cline needle is stuck open by dirt or debrees (that happended to me recently).