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Got it !! It was two valves the rubbers were chewed up and one was half missing.I changed all 6.Good to go! Thanks for all help ,so glad I found this web site.

Pump smooth runs good but my wand drips when pump is not running and when I turn off water to pump dripping from wand stops.valves? Would that affect my control of pressure prob? I changed all 6 valves about 6 months ago and did all new tip,new gun,unloader,tighten belt...

OK and I for got to say that when carwash not in use my gun drips constantly

I can not get my pressure to increase on my 310 cat pump. It won't go more then 1100.I have changed tip ,new gun, tighten belt,new unloader(nut type),I can decreases pressure with unloader but can not increase more then 1100.I have ,a 2504 tip on now but if I put on 2505 I can not get more then...