The water isn't obscuring it! You have NO BORE DISCHARGE!
It looks like the bore may be severed/ruptured and you're getting discharge through the gas reservior. That's why there's no output.
Where did you get this tube?
edit: it could also be discharging through the cooling jacket and into the gas reservoir, rather than through a ruptured bore, but this is unlikely. Disconnect the water, blow it dry with air (low pressure), and do a quick <10sec test to see if it runs better. Let it cool for 5 min before another test. Take a photo on one of the two tests if you can be sure not to run it longer than 10sec.