Troubleshooting Your Power Washer: Why Won't It Start?
Is your power washer refusing to start, leaving you with a pile of dirty surfaces and a sense of frustration? You're not alone. Power washers, like any other machine, can develop issues over time. But before you reach for the phone to call a professional or decide to buy a new one, try these troubleshooting steps to revive your power washer.
Understanding Your Power Washer: A Quick Overview
Power washers, also known as pressure washers, use a pump to force water through a high-pressure nozzle. They come in various types, including electric, gas, and hybrid models. Understanding the basics of your power washer can help you diagnose and fix common starting issues.
Common Reasons Why Your Power Washer Won't Start
- Fuel or Electricity Issues: For gas-powered washers, a lack of fuel or a clogged fuel line can prevent the engine from starting. For electric models, a tripped circuit breaker or a faulty power cord can be the culprit.
- Prime Issues: Electric start power washers may not start if they're not properly primed. Priming ensures that the pump is filled with water, allowing it to build up pressure.
- Spark Plug or Ignition Issues: A fouled or damaged spark plug, or an ignition problem in electric start models, can prevent the engine from starting.
- Pump Issues: If the pump isn't working, your power washer won't build up enough pressure to start. This could be due to a leak, a broken pump, or a lack of lubrication.
- Air in the Fuel System: Air in the fuel system can prevent the engine from starting. This is more common in gas-powered washers that have been left unused for a long time.
Step-by-Step Guide to Troubleshooting Your Power Washer
Check for Fuel or Electricity Issues
Before you start any diagnostic work, ensure that your power washer is getting fuel or electricity. For gas-powered washers, check the fuel level and ensure the fuel line isn't clogged. For electric models, check the circuit breaker and ensure the power cord is securely connected.

Prime Your Power Washer
If your power washer is electric start, ensure it's properly primed. Priming involves filling the pump with water to build up pressure. Consult your user manual for specific instructions, as the process can vary between models.
Inspect the Spark Plug or Ignition System
For gas-powered washers, remove the spark plug and inspect it for fouling or damage. If it's fouled, clean it or replace it. If it's damaged, replace it. For electric start models, check the ignition system for any signs of damage or malfunction.
Check the Pump
Inspect the pump for leaks or damage. If you find a leak, repair it if possible. If the pump is broken, it may need to be replaced. Also, ensure the pump is properly lubricated. Consult your user manual for lubrication instructions.

Check for Air in the Fuel System
If your gas-powered washer hasn't been used for a long time, there may be air in the fuel system. To bleed the air, follow these steps:
| Step | Action |
|---|---|
| 1 | Remove the fuel line from the engine. |
| 2 | Place the fuel line in a container of fuel. |
| 3 | Crank the engine until fuel starts flowing from the fuel line. |
| 4 | Reattach the fuel line and try starting the engine. |
If none of these steps solve the problem, it may be time to call a professional for help.