I always start my tractor and let it warm up before changing the fuel filter. If I have a loss of power when using it, I just shut it down as soon as I can get it back to the shop. I only have one small filter with the plastic site glass and two bleed screws and shut off valve. I shut the fuel off loosen the glass and drop the filter, catching any spillage. After cleaning the glass and filter area I install new filter but I DO NOT tighten the filter. When it is almost tight I turn the fuel on and watch that the glass fills. When full I tighten the glass and start engine at a high idle and run until the air if any is out. I never used the screws on the filter to bleed, or cracked the injector lines. If I was going to crack the injector lines, it would be the furtherest from the pump. After 3 diesel tractors and 4 diesel trucks I think I have it down now!!!!