I was using my pressure washer yesterday and left it running for a few minutes while I hosed off the area that I had just cleaned. After five to ten minutes, the engine stopped. I checked to see if it had run out of gas, but it hadn't. After a few pulls it started again, but would die the second that I pulled the trigger to begin spraying. I have been reading about the "unloader" and am guessing that this may be the problem. Any suggestions beside buying a new pump?