Richard writes: "With respect, the following method might work better for some. You have turned off the fuel lines to and from the primary filter you are changing. You change the filter. The fuel level will now be out of sight because of the fuel that came out with the old filter. You crack the tap on the tank side and simply watch for the fuel level to get to the top of the filter cylinder. Replace the top and you are done. No air, no bleed, no separate tank of top-up diesel, and little mess. Return all taps to normal operating position, final check for leaks, and you are off." And I think it's a great idea, until your fuel level in the tanks is below the level of the filter. My answer to the dilemma: Install an electric priming pump. When RPMs start to fall off in a dangerous place, flip on the pump to pressurize the fuel system to the engine until you are clear to stop and change filters. Rich Gano CALYPSO (GB42-295) Homeport Southport, FL I'd rather be cruisin'