The monster has one feed and one return like every other FI system in existence.
OK, now I've got to double check the Triumph. From memory, when I replaced the plastic ones with the Colder brand brass valves from the recall, I only remember one line. Granted, it was more than 9 years ago when I did it, so I'm sure you're correct.
Any more tips on installing the in-line fittings on the monster? Ways to avoid dumping a ton of gas in my driveway? Positioning of the fittings with relation to the tank, #2 cylinder head, etc?