Oh bugger...if that's the case, it could blow my faulty fuel pump conclusion out of the water!
I thought the fuel feed is Orange and the fuel return is Green?
reading your post again, I was checking for a flow from the fuel pump:
(Not my photo - it's from a quick google - i would of put a cloth down first to catch any spilled fuel)
so I expected some fuel to come out of the pump with the orange line disconnected if the pump was working?