Some tips we have learned over the years.
Bring your hose with your pressure washer: If we don't have a hose to fit your machine we can't test it. Also many times the problem is in the tip or in the hose itself.
Never run equipment on a coiled extension cord. This turns the cord into magnet and robs power from the equipment you are running and can burn it up. Always uncoil the extension cord even if you only need to get a couple feet.
Run your generators every three months. This keeps the gas from "gumming" up in the carb. and also keep the generator excited so it will produce power when you need it to.
Rule of thumb is if it doesn't hum it is not getting power. If a motor doesn't hum check your fuses ot breaker, chances are it is not getting power to the motor. You may also have a bad cord or extension cord.