The air filter
The filter in this image is 9 years old and it does not need to be replaced.
How often should you replace a pressure washers air filter?
The answer depends on how clean the air running through the filter is. Unlike your car, your pressure washer does not operate on the freeway and does not drive through gravel roads, sucking up dirty air. It is not uncommon for the air filter on your pressure washer to last the life of your engine.
First thing to try if your pressure washer does not start: