first check if you have all the parts in your lpr, and everything else at that matter. http://docs.google.com/viewer?a=v&q=...8Uw9NcuzjB9T_Q
that is the manual.
And secondly, it has a constant sound, or a constant clicking or 'shooting' sound? Next try to simply air it up and screw the bolt adjuster in, (the very rear adjuster) if you have one. Mine came with one. Strangely you woldnt think that would or could fix anything, but it has fixed an lpr leak of mine, since it can seal and seat the bolt/ram better.
It's going to take alot of trial and error obviously, but we will fix it. Keep us updated. Make a vid even if you want the most help.