I own two of these pressure washers and have the same problem. Great washer until it sits for four months. The gasoiline sitting was not the problem. Not worth your money unless you have a use for the Honda engine which is great. Washer will run but without pressure when trigger pulled. At first you have to kill the choke to it almost dies, then push choke back out again and the pressure will start again. That is short lived. Eventually it will not work at all. I talked with Karcher and said it is a common problem and can be fixed. There are only two websites that carry parts and do not give instructions or diagrams or pictures of the repair part. They state it is an "Uploader Valve".. I have taken this apart several times and attempemted to repair at no avail. Karcher it seems a lot like Ryobi, if you need parts or help, YOU ARE ON YOUR OWN!!!!!!