It's for my B2150. I was told that if I filled the fuel bowl when reassembling the fuel filter, that I wouldn't need to bleed the lines. The manual states that there are 2 valves the are opened and that bleeds the system after it's run out of fuel, but I only replaced the filter. It's really cold out and don't want to run the tractor if it's not needed at the time. The manual also said that after running, the valve #2 should be closed so there wouldn't be any problems later. I found the #2 valve in the open position when I checked and have run it that way since I bought the tractor a while ago. Thanks for any input.