I need your help pressure washer gurus!!!! I have this pressure pump on my pressure washer......... http://www.catpumps.com/select/pdfs/3SP30G1I.pdf I now have very low pressure after about 3 months of the pressure going up and down every 5-6 minutes. I would turn off the engine and restart it and the pressure would come back for a few minutes. I've been told unloader valve a lot but wish to ask others. There are no leak or clogs. Thanks!!!!