Fuel Probs On My Sprint 955i

Hi all. My buddy gifted me a 2004 Sprint 955i, that will turn over, but not fire up. I put a new battery on the bike, as the olds one was a bit naff. This had a better turn over, but still not firing, so I have diagnosed a fuel problem. I emptied the tank and removed the old and contaminated fuel, got a new filter and I'll put the pump assembly back on later. The question I have is this.. There is a hose from the ECU, that is not connected to anything, but seems to have a perished plug at the end and I cant seem to find where it should be connected. The fuel regulator has a pipe leading off of it and I think that something should be there, but can't see why there would be a fuel pipe [of sorts] connecting to the ECU. Any thoughts on this would help. Cheers