Thanks again for all of the responses! After changing the fuel filters and pump (wish I had known about the $50 pump!...what is your source for aftermarket parts?) I siphoned the tank, ran it out of diesel and blew compressed air thru the fuel line into the tank (the BX 1850 doesn't have a tank strainer) while my wife trashed an old shop vac and just kept moving the hose thru the tank and I kept blowing air. All said and done, there was an accordion piece of plastic (molding leftover?) and some organic crap in the vacuum. I'm guessing the plastic was stuck in the fuel line hole because everything is running fine now.