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Thanks all for replying. I ordered a (correctly sized) regulating unloader and a bypass regulator so hopefully that will solve my problems. I am still confused about one thing though - from my holding tank to the tip of the gun, there is nothing preventing backflow from the low pressure lines...

I've replaced all of the check valves at the manifold and double checked them. I believe my product is coming back through the HP line, back through the HP pump, and then back into the holding tank. Does anyone have a CV at or around the HP pump station? or what about before the manifold above...

First off, thank you all so much for taking the time to bring your expertise to this BB. I have one year under my belt at my 2 bay SS and this board has helped me immensely in learning the business! My first question is this: What is the purpose of regulators, unloaders, and bypass...