I have an 11 HP Honda powered pressure washer. Over the 30 + years that I have owned this machine, I always store it with fuel in the tank over the winter, never running it dry. I add Stabil to the gas and a good dose of MMO and fog it, making sure there is no water in the pump, and the pump has RV anti-freeze in it. There have been several occasions where the machine fired up on one pull. "I" found seasonal equipment that is used at least once a year works just fine for me storing it this way, as long as the fuel was fresh and treated they way I mentioned.