I'm new to the forum but, I've looked into this alot. I just changed all of my fuel lines. my seadoo is an 01 and my lines were already gummed up along with every filter. most people will probably tell you to replace them with new grey lines. I don't feel like going through the same crap again so I did some looking and found some heavy duty hydraulic line at Napa. It's called weatherhead it's 400 psi Maybee a little overkill, but It makes me feel better. I've read alot of posts that say they have had regular hose for a while and had no prob. I hope this helps. If you want more info type fuel lines under the search up top.