I have a Craftsman Pressure Washer - model # 580.752710. I put gas in the tank yesterday for the first time in many months. After pulling the starting cord a few times, the engine started right up, but quit after only a few seconds. When trying to re-start it, the cord was very hard to pull. Figuring that there wasn't enough oil in the cylinder to lube the system at first (after sitting for mionths), I coaxed it though a few more pulls to lube the cyclinder and it did loosen up. After that, it wouldn't start at all. After trying to choke it again (no luck) and then trying to run the extra gas out by then pulling the cord without choking (in case it was flooded), I noticed that gas was dripping steadily from under the air filter. I removed the air filter and the housing only to see that fuel is just flowing in a steady drip from the opening where the fuel and air get mixed (under the choke valve). Obviously, gas is flowing freely to the carb. In fact, that is part of the problem now. I don't even want to try starting the unit again until I find out why the fuel is leaking.
The Managemylife web site is a good resource to find out what may be happening to your Craftsman Pressure Washer. I'm sorry to hear about the difficulties you’re having with your unit. I did some research for you at Managemylife.com and found an excellent article that also has multiple expert answers at the bottom of the web page that addresses the most common questions that have been asked by other members. I hope this will help until your expert can answer your specific question. I attached the link below.
Most likely the old fuel being left in there has gummed up the carburetor. What you describe with the dripping gas tells me the needle valve is stuck open. This could be due to varnish in the carburetor or it could be that the float has a hole in it (from rotting fuel) and is full of gas causing it to hold the needle open.Pick up a can of spray carb/choke cleaner from any auto parts store. Then watch THIS VIDEO to see how to clean the carburetor. Thank you for using Manage My Life!
OK, so that worked... sort of. The whole thing was a little gummed up and I cleaned it as the guy demonstrated in the video. I couldn't get the valve seat out of the carb though, and I may have damaged it trying to do so. After re-assembling everything, it took several pulls to start the engine, which I expected. What I didn't expect was that it would only run with the choke fully engaged for some time. Eventually, I was able to disengage the choke without stalling the engine, but it still only runs smoothly if the trigger on the pressure washer is pulled. If I let go of the trigger, the engine runs rough. Should I replace the needle valve and seat? I assume that I'll be able to get the old seat out by digging it out if I'm not worried about damaging it. Do you think that'll make a difference?
And here is an update to my last post. The system was running OK yesterday with the above small issues. After I was finished using the pressure washer, I put it away in the garage and noticed a little while later that the entire garage smelled like gas. It wasn't dripping out like before, but there was a definite leak. Today, I tried to start the system and it wouldn't start at all :-(
You may want to try going back through the carburetor again cleaning, but more than likely the carburetor is just shot. Old fuel really just messes the carburetor up pretty bad. You can get a carburetor overhaul kit (pt 498260) and see if you can get it back right. The kit will have new seals, needle, seat, and gaskets. Or you can go ahead and get a complete carburetor (pt 499059). I have attached the link where either/or can be ordered.
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