[bestgenman]

I have changed them out on #188.  Yes, the fuel will come out when the line is removed however,  it is a siphon situation so if you raise the line above the tank the fuel will stop.  You will notice from the picture, there is a ball valve on the inlet to prevent fuel flow when the filter is open during canister changes.  Also note the outlet elbow is tapped to feed a small lift pump which had the discharge ending in a ball valve.  Energizing the pump allowed spin on filters to be filled.