since I bought it new. I don't know what it is. It's coming from the brass pump tube, it's getting past the plunger and being pulled up and overflowing. This leads to more and more leakage the longer I use it at a time. I end up with a large wet spot on my back, this last time I was spraying for a good about of time, maybe 30 min., and my whole back was wet, my pants were wet as well. I've taken it to the dealer I bought it from once, and they inspected it and gave it an "OK", but they said that if they did anything above inspecting it that it would cost me shop labor. I bought the thing last September and I know it came with a warranty, what should I do? I need a sprayer and this is supposed to be the best on the market, that's why I paid so much for it. But it seems as if I'm having a leakage problem that no one else with this sprayer is having.