I just ran into this problem. The feed line to the remote needle valve is very
difficult to remove, because the engine is tilted just a bit downwards. The engine
cannot be fueled from the front side of the carb, because the needle valve is too
restrictive of fuel flow, and the fueling line blows off....from the pressure.

The answer was to fuel into the vent line with the feed line removed from the nipple
to allow the venting of fuel. The tank can be de-fueled from the fuel line to the carb, as normal....but it's easier to just run the plane out of fuel after the last flight.

Dave.