This one is for all the users of the chemlawn guns provided by lesco. i am fairly new to this so bear with me. I had a truck/ spray rig built to start liquid fertilization. it came with a chemlawn spray gun and at first worked great. Howeber its acting very strange, and i hope someone can help. Its got a yellow 2.0 gpm nozzle and it is not clogged but i cant get it to spray under any pressure. the most i can get out of it is 1 gpm. if i increasae the pressure the gun just stops spraying. but if i lock the trigger and increase the throttle it will do fine with the pressure. any ideas?