F*cking hell, Raul, no wonder you ran outta fuel mate, those lines are about a foot too long! I had a similar problem on my GS1000 Pete, and my fuel line that I fitted was only an inch or two longer than the one I replaced, it went up slightly before it went back down to the carbs, and that was enough for it to conk out.
One day I conked out on the side of the Hume highway, and a car full of Arab terrorists stopped to help me out, (well, not everyone in Al Queda is an #$%*, is he?) as I'd flattened the battery they tried to push-start me, well, they pushed and pushed, for maybe twenty minutes, but it didn't even fire, then just as we were about to push my bike off the side of the road so that Ahmet and Ahkmed could blow it up and I could collect the insurance, I noticed that I'd accidentally moved the kill switch to "off"?
Hmmmnnn........... I didn't tell the rest of my red-faced new "friends" that I'd f*cked up as they were looking pretty angry by now, and muttering things about "May the fleas of a thousand camels infest Mr Suzuki's armpits" so I suggested "what about one more go guys" and within a couple of yards it went "Varoom", so I didn't stop to thank them all individually and offer to strap on a couple of pounds of C4 and stop in at McDonalds on my way home, I just buggered off!
It was all because I thought (like Raul) that I'd add a little more line to make it easier to remove the tank, but it drove me nuts until I finally removed the OEM "Vacuum" petcock (great in theory, miserable in practise) and replaced it with a Pingel, then all was well with the world. Cheers, Terry.