I had 2 of these machines, sold one of them, one started running very poorly. Exactly like it was running out of fuel, ordered a fuel pump for it and replaced it. There is one little problematic clip in the pump removal procedure, it is on the fuel line. A little green clip that is a bit of a bear to get to release, but once that is released, it literally took me 10 minutes to install the new pump. It fired right up after the replacement and hasn't been a problem since. Whether it was the built in filter or the pump itself i dont know but it was worth the money to just replace the pump and have it take care of the issue.