The answer to 'why is my pressure washer odor' is that a smelly pressure washer is often caused by stagnant water or fuel buildup in the machine. This can happen if the pressure washer is left unused for an extended period or if it wasn't properly cleaned and stored after last use. The odor is usually a sign of bacterial growth or fuel degradation inside the machine.
To fix the odor, you'll need to thoroughly clean and flush the pressure washer. Start by running the machine with fresh fuel and hot water to remove any built-up grime or residue. You can also add a pressure washer cleaner or sanitizer to the water to help kill any bacteria. If the odor persists, you may need to disassemble the machine to clean the internal components more thoroughly. In some cases, replacing worn parts like the pump or hoses may be necessary.