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Why does my gas machine have low pressure unless I remove my nozzles and reattach? Article Updated 10/19/09 Gas Machines Only This can be caused by a dirty or sticking unloader valve. This valve may be sticking in place and usually needs to be cleaned and lubricated with lithium grease. The location of the unloader valve varies on our pumps, but it is always located on the brass pump head. Be sure not to remove the bolts that connect the head of the pump to the transmission housing. Usually the unloader valve can be found under the black plastic cap. Though if your machine does not have this cap, it is located under the hexagonal nut closest to the transmission housing. For machines with a pressure regulator, it is located under the pressure dial. Once you have removed the unloader, you want to inspect it to be sure that the o-rings and spring are in good shape. If there are any mineral deposits on the unloader or in the hole it sits in, you will want to clean these up with a little vinegar and a wire brush. Then, apply a small amount of lithium grease to the top o-ring on the unloader and reassemble the pump. You can contact one of these dealers/distributors for parts, diagrams, assistance or an estimate for repair: R. J. Bowers - phone: 800-383-6584, web: www.rjbowers.com. Jineco Equipment - phone: 800-999-2245, web: www.pressureparts.com You can also contact a local service center by going to our Service Center Locator at: http://www.karcherresidential.com/en/showlocator.php?param1=2   How can we improve this information? Not the information you were looking for? Let us know how we can better answer this question. We routinely review user comments to help us better provide the information you are seeking. Please note that this is for feedback only, you will not receive a direct response to your comment. If you need a personal response, please click on "Submit a Tech Support Ticket" below. Thanks! Image verification required Please enter the characters that appear to the right in the space provided. This is just to verify that you are a human. Full Name: E-mail Address: (optional) Your feedback on how to improve the answer to the above question: