Are you replacing the fuel line and bulb assembly, or the actual fuel line? If it's the fuel line / bulb - I'd definitely stick with a Merc / Quicksilver part vice aftermarket. After recently replacing mine and looking through all the info available, I purchased a Merc part from the dealer - gray hose with blue writing.
For line only, I discovered that most recommend Trident Marine Fuel Line A1, which just so happens to be what my boat was factory rigged with, so I didn't have to replace mine after checking to ensure I didn't have any problems with it.
All the best,
Glenn