I have a gas pressure washer.

Some people tell me it's important not to leave the pressure with gas in it because it can clog the engine and stop working.

So, I tried running the pressure washer until it's out of gas.

But, then sometimes letting the pressure washer run out of gas causes it to "vapor lock," and it won't start again even after I add gas back into it. I also read online never to let a pressure washer run out of gas.

So, which is it? How do I store the pressure washer without gas in it, if I'm never supposed to let it run out of gas.

  • 3
    End of season/not using it for the next few months, you want to drain/use the last of the gas. Gas goes icky if not used. Do not think you get 'vapour lock' but the gas needs some time to refill all the lines/tubes again before it starts.
    – crip659
    Commented Apr 20 at 17:47
  • 2
    There are some treatments to stop gas aging.
    – Solar Mike
    Commented Apr 20 at 18:41

1 Answer 1


If the pressure washer can use "Clear Gas" (Gas without ethanol), this will help. The big box and most hardware stores sell it in 1 gallon cans.

For example we use it for our generators. We learned the hard way not to use ethanol gas (having to get our honda generators cleaned).

It is have 6 or 7 years and we haven't had an issue since. We test run the generators ever three or four months for about 15 minutes.

Some RV Centers may also have ethanol free at the pump.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.