At some 242 hours on a BX purchased in summer 2010 I have more than my share of fuel related problems. I blame some on using a biocide and maybe some plugging in fuel tank. Also fuel filters seemed to load up too early. However, along the line I switched fuel pumps such that factory supplied were viewed with suspicion since I could only get 3 psi out of them when the rated range is 3 to 6 psi. A total of five fuel pump changes were made, some with new and some placing original factory pump back once. I looked on Internet to see about other than factory pumps and they run in cost starting at about $10.. Bought two from a source in Hong King at $18 each. Puts out 6 psi. Slightly different design. That is part number HEP-02A. Service life on the first one used was only 10 hours. The one factory model that failed got over 100 hours at least. These cost about $150. So far I'll have to run with only them for the time being. These pumps use a piston that rides back and forth in a cylinder, activated via a coil surrounding the cylinder. Nothing rotates. Number one fuel filter now is one originally made for a Grand L tractor. Look up on U-tube for a Canadian making this switch.