I have a dilemna. I was advised by the people who sold me my pressure washer to adjust the pressure by adjusting the unloader. I did that to lower my pressure in order to wash a fence. I have a 13 hp Honda with a comet pump that I have been informed by the seller should be a 3500 psi 4 gpm set-up. To set the unloader back to what it should be I purchased a guage to measure my pressure so that I could reset it. With a 40 degree #4 tip I adjusted the unloader with the gun open until the guage registered 3500 psi. I assumed that everything should be back to normal and that I could now adjust my pressure by changing tips as recommended by the pros. When I let go of the trigger the guage moves up toward 4000 psi. While testing my chemical injector's reported 5 to 1 ratio I shot water into a 5 gallon container with a soap nozzle for 1 minute to read my machines gpm and to see if the mixing ratio was correct. I was surprised, however, to find that the output into the container actually was 5 gpm. Does the 4 gpm machine add the extra gallon coming through the injector to the actual flow to create the 5 gpm result I experience? Now I'm wondering if some further adjustment is needed. I have purchased tips for a 3500 gpm 4 gpm. Am I missing something - should I expect 5 gpm when using a soap tip? Is there a suggested procedure that I should follow to get my equipment to its proper operating pressure?
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