The answer to 'why is my pressure washer odor' is that a pressure washer odor is often caused by a buildup of mold, mildew, or other organic matter in the machine. This can happen if the pressure washer is not properly cleaned and stored after each use. The odor may also be caused by a fuel leak or engine issues.
To troubleshoot the odor, start by thoroughly cleaning the pressure washer, including the pump, hoses, and nozzles. You can use a mild detergent and warm water to scrub away any buildup. If the odor persists, it may be an indication of a more serious problem, such as a fuel leak or engine issue, that will require the attention of a professional pressure washer repair technician.