Originally Posted by F470
How does that work?
Combination of spring loaded ball/helical valves that get disengaged once appropriate pins push them out when connected. Too much room for accidents/leaks otherwise. Usually it to the tune of like on Suzuki - male connector has a visible ball and femail has pin and a ball. Once you push connector together O-ring seals between male and female. Pin on female side pushes ball on male side and also another ball deeper in female connector. Both open for fuel flow. When disconnected both balls just snap into place closing flow.